AM53CF94 datasheet(35/76 Pages) AMD

35 / 76 page

P R E L I M I N A R Y

AMD

Am53CF94/Am53CF96

Control Register Four

CNTLREG4

Address: 00H

765

210

GE1

GE0

PWD

RES

RES (R)

RAE(W)

RADE

RES

000

GLITCH EATER

Power-Down

Reserved

RES (R)/Active Negation Ctl (W)

Active Negation Ctl.

Transfer Count Test Enable

Control Register Four (0DH)

17348B-33

This register is used to control several AMD proprietary

features implemented in the Am53CF94/96. At power

up, this register will show a ‘0’ value on all bits except

bit 4.

CNTLREG4 – Bit 7:6 – GE1:0 – GLITCH EATER

The GLITCH EATER circuitry has been implemented on

all SCSI input lines and are controlled by bits 7and 6.

The valid signal window may be adjusted by setting the

bits in the combinations listed below.

CNTLREG4

Bit 7

Bit 6

Single-

GE1

GE0

ended

Differential

12 ns

0 ns

25 ns

35 ns

0 ns

12 ns

CNTLREG4 – Bit 5 – PWD – Power-Down Feature

Setting this bit to ‘1’ will enable AMD’s exclusive power-

down feature. This will turn off the input buffers on all the

SCSI bus signal lines to reduce power consumption dur-

ing the chip’s sleep mode.

CNTLREG4 – Bit 4 – RES

This bit is reserved for internal use.

CNTLREG4 – Bit 3 (Read Only) – RES

This bit is reserved for internal use.

CNTLREG4 – Bit 3 (Write Only) – RAE – Active

Negation Control

CNTLREG4 – Bit 2 – RADE – Active Negation

Control

Bits 2 and 3 control the Active Negation Drivers which

may be enabled on

REQ, ACK, or DATA lines. The fol-

lowing table shows the programming options for this

feature:

CNTLREG4

Bit 3

Bit 2

Function Selected

RAE

RADE

Active Negation

Disabled

Active Negation on

REQ and ACK only

––

Active Negation on

REQ, ACK and DATA

–– = don’t care

CNTLREG4 – Bit 1 – RES

This bit is reserved for internal use.

CNTLREG4 – Bit 0 – NU – Not Used

The NCR53CF94/96 uses this bit to control back-to-

back transfers. This bit may be read or written but is not

used by the Am53CF94/96. Back-to-Back transfers are

always enabled.

AM53CF94 数据表(PDF) 35 Page - Advanced Micro Devices

AM53CF94 数据表(HTML) 35 Page - Advanced Micro Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

数据表下载

链接网址

AM53CF94 数据表(PDF) 35 Page - Advanced Micro Devices

AM53CF94 数据表(HTML) 35 Page - Advanced Micro Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

数据表 下载

链接网址

数据表下载