AM53CF94KC datasheet(14/76 Pages) AMD

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P R E L I M I N A R Y

AMD

Am53CF94/Am53CF96

DMAWR

DMA Write

(Input, Active Low)

This signal writes the data onto the DMA 15–0 and

DMAP 1–0 bus into the internal FIFO when

DACK is

also active. When in the single bus mode this signal

must be tied to the

WR signal.

Read

(Input Active Low)

This signal reads the internal device registers and

places their contents on the data bus, when either

signal or

DACK signal is active.

Write

(Input Active Low)

This signal writes the internal device registers with the

value present on the (AD 7–0 bus or the DMA 15–0 and

DMAP 1–0 bus), when the

CS signal is also active.

Chip Select

(Input Active Low)

This signal enables the read and write of the device reg-

isters.

CS enables access to any register (including the

FIFO) while the

DACK enables access only to the FIFO.

CS and DACK should never be active simultaneously in

the single bus mode, they may however be active simul-

taneously in the dual bus mode provided the

CS signal is

not enabling access to the FIFO.

INT

Interrupt

(Output, Active Low, Open Drain)

This signal is a non-maskable interrupt flag to the host

processor. This signal is latched on the output on the

high going edge of the clock. This flag may be cleared by

reading the Interrupt Status Register (ISTAT) or by per-

forming a device reset (hard or soft). This flag is not

cleared by a SCSI reset.

DFMODE

Differential Mode

(Input, Active Low)

This input is available only on the Am53CF96. This input

configures the SCSI bus to either single ended or differ-

ential mode. When this input is active, the device oper-

ates in the differential SCSI mode. The SCSI data is

available on the

SD 7–0 lines and the high active trans-

ceiver enables on the

SDC 7–0 outputs. When this input

is inactive, the device operates in the single ended SCSI

mode. The SCSI input data is available on

SD 7–0 lines

and the output data is available on

SDC 7–0 lines. In the

single ended SCSI mode, the

SD 7–0 and the SDC 7–0

buses can be tied together externally.

BUSMD 1–0

Bus Mode

(Input, Active High)

These inputs configure the device for single bus or dual

bus operation and the DMA bus width.

BUSMD1

BUSMD0 Bus Configuration

Two buses: 8-bit Host Bus

and 16-bit DMA Bus

and Data on AD Bus

Two buses: Multiplexed

and byte control

and Data on AD Bus

Single bus: 8-bit Host Bus

and 16-bit DMA Bus

and Data on DMA Bus

Single bus: 8-bit Host Bus

and 8-bit DMA Bus

and Data on DMA Bus

CLK

Clock

(Input)

Clock input used to generate all the internal device tim-

ings. The maximum frequency of this input is 40 MHz.

and a minimum of 10 MHz to maintain the SCSI bus

timings.

RESET

Reset

(Input, Active High)

This input when active resets the device. The RESET in-

put must be active for at least two CLK periods after the

voltage on the power inputs have reached Vcc

minimum.

SCSI Interface Signals

SD 7–0

SCSI Data

(Input/Output, Active Low, Schmitt Trigger)

When the device is configured in the Single Ended SCSI

Mode (

DFMODE inactive) these pins are defined as in-

puts for the SCSI data bus. When the device is config-

ured in the Differential SCSI Mode (

DFMODE active)

these pins are defined as bidirectional SCSI data bus.

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