Owner manual

AT76C551

1612D–08/01

• SIR6 – GPR1: General Purpose Register 1 GPR1

PCMCIA addr: 0006 hex W 8 bits

• Bits 7..0 – GPR1[7:0]

The host can only write GPR1. GPR1 bits 7..0 are reflected to bits 7..0 of MIR4 so theARM

core can read them.

Note: Default Value: 00 hex

SIR7 – GPR2: General Purpose Register 2

PCMCIA addr: 0007 hex 8 bits

• Bits 7..0 – GPR2[7:0]

The host can only write GPR2. GPR2 bits 7..0 are reflected to bits 15..8 of MIR4 so the ARM

core can read them.

Note: Default Value: 00 hex

SIR8 – GPR3: General Purpose Register 3

PCMCIA addr: 0008 hex W 8 bits

• Bits 7..0 – GPR3[7:0]

The host can only write GPR3. GPR3 bits 7..0 are reflected to bits 7..0 of MIR5 so the ARM

core can read them.

Note: Default Value: 00 hex

In general, General Purpose Registers provide a means of one-way communication from the

host driver software to AT76C551 firmware. Each GPR bit, or field, can carry any kind of infor-

mation (configuration information, status information, command signaling) required by the

interface between host driver software and AT76C551 firmware.

• SIR9 – MR1: Mirror Register 1

PCMCIA addr: 000E hex R 8 bits

• Bits 7..0 – MR1[7:0]

The host can only read MR1. MR1 bits 7..0 reflect bits 7..0 of MIR0, which can be written by

the ARM core.

Note: Default Value: 00 hex

SIR10 – MR2: Mirror Register 2

PCMCIA addr: 000F hex R 8 bits

• Bits 7..0 – MR2[7:0]

The host can only read MR2. MR2 bits 7..0 reflect bits 15..8 of MIR0, which can be written by

the ARM core.

Note: Default Value: 00 hex

SIR11 – MR3: Mirror Register 3

PCMCIA addr: 0010 hex R 8 bits

• Bits 7..0 – MR3[7:0]

The host can only read MR3. MR3 bits 7..0 reflect bits 7..0 of MIR1, which can be written by

the ARM core.

Note: Default Value: 00 hex