AM53CF94JC datasheet(36/76 Pages) AMD

36 / 76 page

P R E L I M I N A R Y

AMD

Am53CF94/Am53CF96

Data Alignment Register (0FH) Write

17348B-34

DA7

DA6

DA5

DA4

DA3

DA2

DA1

DA0

Data Alignment Register

Address: OF H

DALREG

Type: Write

The Data Alignment Register (DALREG) is used if the

first byte of a 16-bit DMA transfer from the SCSI bus to

the host processor is misaligned. Prior to issuing an in-

formation transfer command, the host processor must

set the Data Alignment Enable (DAE) bit in Control Reg-

ister Two (CNTLREG2).

This register may be loaded immediately following the

phase change to Synchronous Data In. This byte will

become the LSB of the first word transmitted from the

FIFO to the DMA controller. The MSB will be comprised

of the first byte received over the SCSI bus. Together,

these bytes constitute the first 16-bit word transferred to

memory.

DALREG – Bits 7:0 – DA 7:0 – Data Alignment 7:0

Part-Unique ID Register (0EH) Read Only

This register extends the transfer counter from 16 to 24

bits and is only enabled when the ENF bit is set (bit 6,

Control Register Two). The descriptions accompanying

the Start Transfer Count Registers and the Current

Count Registers should be referenced for more informa-

tion regarding the transfer counter.

This register is also used to store the part-unique ID

code for the Am53CF94/96. This information may be ac-

cessed when all of the following are true:

1) A value has not been loaded into this register

2) A DMA NOP command has been issued (code 80h)

3) Bit 6 in Control Register Two is set (ENF bit)

4) A power up or chip reset has taken place

When the above conditions are satisfied, the following

bit descriptions apply:

Am53CF94, 3 V

Am53CF94, 5 V

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