AM53CF96KC/W AMD (ADVANCED MICRO DEVICES), AM53CF96KC/W Datasheet - Page 35

• Manufacturer Part Number: AM53CF96KC/W
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM53CF96KC/W

• Lead Free Status / RoHS Status: Not Compliant

Control Register Four (0DH)
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 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 CNTLREG4
Bit 7
GE1
0
1
0
1
Bit 6
GE0
0
0
1
1
Control Register Four
CNTLREG4
GE1
7
0
GE0
6
0
Single-
ended
12 ns
25 ns
35 ns
0 ns
PWD
5
0
Differential
RES
4
X
25 ns
35 ns
12 ns
0 ns
Am53CF94/Am53CF96
RES (R)
RAE(W)
3
0
RADE
2
0
RES
X
1
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 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.
Address: 00
–– = don’t care
CNTLREG4
Bit 3
RAE
0
NU
––
X
0
1
H
Transfer Count Test Enable
Active Negation Ctl.
RES (R)/Active Negation Ctl (W)
Reserved
Power-Down
GLITCH EATER
CNTLREG4
RADE
Bit 2
0
0
1
17348B-33
Function Selected
Active Negation
Disabled
Active Negation on
REQ and ACK only
Active Negation on
REQ, ACK and DATA
AMD
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