INIC-1511 Ver la hoja de datos (PDF) - Unspecified

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INIC-1511

USB to PATA Bridge

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INIC-1511 (Preliminary)

4. NVRAM Program/Download procedure

4.1 CPU Write NVRAM.

1. CPU write access address at register I2C_Addr(0x40E0).

2. CPU write data at register I2C_Data(0x40E1).

3. CPU write Control Code at register I2C_Ctrl(0x40E2).

4. CPU write Run and Read_Write direction(0) at register I2C_Comm(0x40E3).

5. CPU poll I2C_Comm bit 7, wait until cleared.

6. CPU may read register I2C_Status(0x40E4) to check write success or not.

4.2 CPU Read NVRAM.

1. CPU write access address at register I2C_Addr(0x40E0).

2. CPU write Control Code at register I2C_Ctrl(0x40E2).

3. CPU write Run and Read_Write direction(1) at register I2C_Comm(0x40E3).

4. CPU poll I2C_Comm bit 7, wait until cleared.

5. CPU read register I2C_Data(0x40E1).

6. CPU may read register I2C_Status(0x40E4) to check read success or not.

4.3 CPU Poll NVRAM.

After write data to NVRAM, NVRAM need certain time before next write operation can be

accepted. CPU may poll NVRAM to decide NVRAM ready or not. It is done same as a NVRAM read. If

I2C_Status(0x40E4) bit 0 is 1, the NVRAM not ready.

4.4 Host Read/Write 8051 data space from USB

1. Host send READ_CHIP_ID packet through control channel to read chip-ID, which is

0x29C5_1511 here. Default hardware report PID is 0x1518.

2. Host send HOLD_CPU packet through control channel to set HOLD_CPU bit.

3. Host may send DATA_WRITE/DATA_READ packet through control channel to WRITE/READ

8051 data space.

DATA_WRITE setup packet format is,

offset

0

1

2

3

4

5

6

7

field

size

bmReqType 1

bReq

1

wValue

2

wIndex

2

wLength

2

value

0x40

0x81

Addr[7:0]

Addr[15:8]

Data[7:0]

0x00

0x00

0x00

DATA_READ setup packet format is,

Description

Vendor write

Data space write

Address to be writen

Data space data

Don’t care

offset

0

1

2

3

field

size

bmReqType 1

bReq

1

wValue

2

value

0xc0

0x82

Addr[7:0]

Addr[15:8]

data

Data from

Data space

Description

Vendor read

Data read

Address to be writen

Initio Corporation Confidential

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