Rainbow Electronics AT76C551 - Manual (Page 27)

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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
I n 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