Texas Instruments OMAP5910 Manuale utente

OMAP5910 Dual-Core Processor

MicroWire Interface

Reference Guide

Literature Number: SPRU686

October 2003

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5OMAP5910SPRU686

Preface

Read This First

About This Manual

This serial synchronous interface can drive two serial external components.

For the external devices, this interface is compatible with the MicroWire

standard and is seen as the master.

Notational Conventions

This document uses the following conventions.

-Hexadecimal numbers are shown with the suffix h. For example, the

following number is 40 hexadecimal (decimal 64): 40h.

Related Documentation From Texas Instruments

The following documents describe the OMAP5910 device and related

peripherals. Copies of these documents are available on the Internet at

www.ti.com. Tip: Enter the literature number in the search box provided at

www.ti.com.

OMAP5910 Dual-Core Processor MPU Subsystem Reference Guide (litera-

ture number SPRU671)

OMAP5910 Dual-Core Processor DSP Subsystem Reference Guide

(literature number SPRU672)

OMAP5910 Dual-Core Processor Memory Interface Traffic Controller

Reference Guide (literature number SPRU673)

OMAP5910 Dual-Core Processor System DMA Controller Reference Guide

(literature number SPRU674)

OMAP5910 Dual-Core Processor LCD Controller Reference Guide (litera-

ture number SPRU675)

OMAP5910 Dual-Core Processor Universal Asynchronous

Receiver/Transmitter (UART) Devices Reference Guide (literature number

SPRU676)

Trademarks

6OMAP5910 SPRU686

OMAP5910 Dual-Core Processor Universal Serial Bus (USB) and Frame

Adjustment Counter (FAC) Reference Guide (literature number SPRU677)

OMAP5910 Dual-Core Processor Clock Generation and System Reset

Management Reference Guide (literature number SPRU678)

OMAP5910 Dual-Core Processor General-Purpose Input/Output (GPIO)

Reference Guide (literature number SPRU679)

OMAP5910 Dual-Core Processor MMC/SD Reference Guide (literature

number SPRU680)

OMAP5910 Dual-Core Processor Inter-Integrated Circuit (I2C) Controller

Reference Guide (literature number SPRU681)

OMAP5910 Dual-Core Processor Timer Reference Guide (literature number

SPRU682)

OMAP5910 Dual-Core Processor Inter-Processor Communication

Reference Guide (literature number SPRU683)

OMAP5910 Dual-Core Processor Camera Interface Reference Guide

(literature number SPRU684)

OMAP5905 Dual-Core Processor Multichannel Serial Interface (MCSI)

Reference Guide (literature number SPRU685)

OMAP5910 Dual-Core Processor Micro-Wire Interface Reference Guide

(literature number SPRU686)

OMAP5910 Dual-Core Processor Real-Time Clock (RTC) Reference Guide

(literature number SPRU687)

OMAP5910 Dual-Core Processor HDQ/1-Wire Interface Reference Guide

(literature number SPRU688)

OMAP5910 Dual-Core Processor PWL, PWT, and LED Peripheral

Reference Guide (literature number SPRU689)

OMAP5910 Dual-Core Processor Multichannel Buffered Serial Port (McBSP)

Reference Guide (literature number SPRU708)

Trademarks

OMAP and the OMAP symbol are trademarks of Texas Instruments.

Related Documentation From Texas Instruments / Trademarks

Contents

7SPRU686

Contents

1 MicroWire Interface 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 MicroWire Registers 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Protocol Description 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Example of Protocol Using a Serial EEPROM (XL93LC66) 21. . . . . . . . . . . . . . . . . . . . . . . .

1.3.1 Read Cycle 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.2 Write Cycle 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Example of Protocol Using an LCD Controller (COP472-3) 23. . . . . . . . . . . . . . . . . . . . . . . .

1.4.1 Loading Sequence 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Example of Protocol Using the Autotransmit Mode 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Example of the Autotransmit Mode With DMA Support 26. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

1 Block Diagram 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Behavior of a X25C02 EEPROM Read Cycle 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Behavior of a XL93LC66 EEPROM Read Cycle 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Read Cycle in the Autotransmit Mode 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1 MicroWire Registers 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Transmit-Data Register (TDR) 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Receive-Data Register (RDR) 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Control-and-Status Register (CSR) 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Setup Register 1 (SR1) 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Setup Register 2 (SR2) 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Setup Register 3 (SR3) 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 Setup Register 4 (SR4) (Read/Write) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9 Setup Register 5 (SR5) (Read/Write) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8SPRU686

9MicroWire InterfaceSPRU686

MicroWire Interface

1 MicroWire Interface

This serial synchronous interface can drive two serial external components.

For the external devices, this interface is compatible with the MicroWire

standard and is seen as the master (see Figure 1).

A transmit DMA mode is available.

Figure 1. Block Diagram

Clock

divider

Transmit data register UWIRE.SDO

Control

logic

UWIRE.SCLK

IPB

Receive data register UWIRE.SDI

Control−and−status

Setup registers

UWIRE.CS[3:0]

Clock register

Clock

enable

MPUXOR_CK

DMA_REQ to system DMA_REQ[6:0]

Inth lvl2 (2,3) - edge

(16 bits)

1.1 MicroWire Registers

The starting address in the peripheral range (hex) is FFFB:3000

Table 1 lists the MicroWire registers. Table 2 through Table 9

describe the individual registers.

Table 1. MicroWire Registers

TDR Transmit data register W16 bits FFFB:3000 0x00

RDR Receive data register R16 bits FFFB:3000 0x00

MicroWire Interface

MicroWire Interface10 SPRU686

Table 1. MicroWire Registers (Continued)

CSR Controland status register R/W 16 bits FFFB:3000 0x04

SR1 Setup register 1 R/W 16 bits FFFB:3000 0x08

SR2 Setup register 2 R/W 16 bits FFFB:3000 0x0C

SR3 Setup register 3 R/W 16 bits FFFB:3000 0x10

SR4 Setup register 4 R/W 16 bits FFFB:3000 0x14

SR5 Setup register 5 R/W 16 bits FFFB:3000 0x18

Table 2. Transmit-Data Register (TDR)

Bits Field Description Reset

Value

15−0 TD Data to transmit Undefined

Whatever its size, the word must be aligned on the most significant bit (MSB)

side.

Note:

The MSB (bit 15) is the first transmitted bit.

Table 3. Receive-Data Register (RDR)

Bits Field Description Reset

Value

15−0 RD Received data Undefined

Whatever its size, the word is aligned on the least significant bit (LSB) side.

Note:

The LSB (bit 0) is the last received bit.

MicroWire Interface

11MicroWire InterfaceSPRU686

Table 4. Control-and-Status Register (CSR)

Bits Field Value Description Reset

Value

15 RDRB RDRB bit = 1 indicates that the receive (RDR) area is full.

When the controller reads the content of the RDR, this bit

is cleared.

This bit is read only.

14 CSRB CSRB bit = 0 indicates that the control and status register

(CSR) is ready to receive new data.

After starting a MicroWire transfer with the CSR, this bit is

set to 1. When the corresponding action has been done,

the CSRB is reset. This bit is controlled by a MicroWire

internal state machine running on the F_INT internal clock

(12 MHz/N). If the CSR is read just after being written and

the MPU is running at a high frequency (60 MHz or 120

MHz, for instance) compared to the internal clock, the

CSRB status bit may still be low for the first read access.

The CSRB latency is 0 if the transfer was initiated by

modifying the CS_CMD bit, but it can be 0−3 cycles if

initiated by the START bit. Some suggested work-arounds

are to: (a) have a few NOPs between initiating a MicroWire

transfer and checking the CSRB status or( b) check that

the CSRB first has a high value on an initial read before it

goes low on a subsequent read.

This bit is read only.

13 START 1 Start a write and/or a read process.

This bit is automatically reset by the internal logic when a

write or a read process is activated.

Send the NB_BITS_WR bits (contained in TDR) to the

serial output DO. If the NB_BITS_WR is equal to zero,

then the write process is not started.

Receive the NB_BITS_RD bits from the serial input DI and

store them in the RDR.

12 CS_CMD 1 Set the chip-select of the selected device to its active level. 0

11−10 INDEX Index of the external device Undefined

00 CS0

01 Reserved

10 Reserved

11 CS3

MicroWire Interface

MicroWire Interface12 SPRU686

Table 4. Control-and-Status Register (CSR) (Continued)

Bits Reset

Value

DescriptionValueField

9−5 NB_BITS_WR Number of bits to transmit Undefined

4−0 NB_BITS_RD Number of bits to receive Undefined

This register sets up the serial interface for the first and the second external

components.

Table 5. Setup Register 1 (SR1)

Bits Field Value Description Reset

Value

11−6 Reserved

5 CS0_CHK Before activating a write process, determines if the

external device is ready.

Undefined

0 No check is done and the write process is immediately

executed.

1 If the DI signal is low, the interface considers the

external component busy; if the DI is high, the interface

considers that the first external component is ready and

starts the write process.

Used when the CS0 is selected.

4−3 CS0_FRQ Defines the frequency of the serial clock, SCLK, when

the CS0 is selected (F_INT is the frequency of the

internal clock to the MicroWire control logic as defined in

Undefined

00 F_INT/2

01 F_INT/4

10 F_INT/8

11 Reserved

2CS0CS_LVL Defines the active level of the chip-select by CS0 0

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