AM79C976KI AMD (ADVANCED MICRO DEVICES), AM79C976KI Datasheet - Page 151

• Manufacturer Part Number: AM79C976KI
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C976KI

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 2.97V
• Operating Supply Voltage (max): 3.63V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 208
• Lead Free Status / RoHS Status: Not Compliant

9/14/00
RST Pin
Bit
4
3
2
1
0
High
High
High
Low
EDI/EDO
Name
Read in Progress
EEN
RES
ECS
ESK
PREAD or Auto
X
1
0
0
EEPROM Port Enable. When this bit is set to a 1, it causes the values of ECS, ESK, and EDI to be
driven onto the EECS, EESK, and EEDI pins, respectively. If EEN = 0 and no EEPROM read
function is currently active, then EECS will be driven LOW. When EEN = 0 and no EEPROM read
function is currently active, EESK and EEDI pins will be driven by the LED1 and LED0 functions,
respectively. See Table 54.
Reserved location. Written as 0; read as undefined.
EEPROM Chip Select. This bit is used to control the value of the EECS pin of the interface when
the EEN bit is set to 1 and the PREAD bit is set to 0. If EEN = 1 and PREAD = 0 and ECS is set to
a 1, then the EECS pin will be forced to a HIGH level at the rising edge of the next clock following
bit programming.
If EEN = 1 and PREAD = 0 and ECS is set to a 0, then the EECS pin will be forced to a LOW level
at the rising edge of the next clock following bit programming. ECS has no effect on the output
value of the EECS pin unless the PREAD bit is set to 0 and the EEN bit is set to 1.
EEPROM Serial Clock. This bit and the EDI/EDO bit are used to control host access to the
EEPROM. Values programmed to this bit are placed onto the EESK pin at the rising edge of the
next clock following bit programming, except when the PREAD bit is set to 1 or the EEN bit is set
to 0. If both the ESK bit and the EDI/EDO bit values are changed during the same register write
operation, while EEN = 1, then setup and hold times of the EEDI pin value with respect to the EESK
signal edge are not guaranteed.
ESK has no effect on the EESK pin unless the PREAD bit is set to 0 and the EEN bit is set to 1.
EEPROM Data In/EEPROM Data Out. Data that is written to this bit will appear on the EEDI output
of the interface, except when the PREAD bit is set to 1 or the EEN bit is set to 0. Data that is read
from this bit reflects the value of the EEDO input of the interface.
EDI/EDO has no effect on the EEDI pin unless the PREAD bit is set to 0 and the EEN bit is set to 1.
Table 54. Interface Pin Assignment
EEN
X
X
1
0
P R E L I M I N A R Y
Am79C976
From ECS Bit
EECS
Active
0
0
Description
From ESK Bit
Tri-State
EESK
Active
LED1
From EDI Bit
Tri-State
Active
LED0
EEDI
151