AM79C976KI AMD (ADVANCED MICRO DEVICES), AM79C976KI Datasheet - Page 129

• 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

AUTOPOLL4:
Offset 090h
This register controls the automatic polling of a user-
selectable external PHY register, AP_REG4.
9/14/00
14-13
12-8
4-0
Bit
15
7
6
5
AP_REG4_ADDR
AP_PHY4_ADDR
AP_PHY4_DFLT
AP_PRE_SUP4
AP_REG4_EN
Name
Auto-Poll4 Register
RES
RES
Enable Bit for Autopoll Register 4. When this bit and the Auto-Poll External PHY bit (APEP) in
CMD3 are both set to 1, the Auto-Poll State Machine periodically reads the external PHY register
selected by the AP_PHY4_ADDR and AP_REG4_ADDR fields and sets the APINT4 interrupt bit
if it detects a change in the register’s contents.
Reserved locations. Written as zeros and read as undefined.
AP_REG4 Address. This field contains the register number of an external PHY register that the
Auto-Poll State Machine will periodically read if the AP_REG4_EN bit in this register and the
APEP bit (CMD3, bit 24) is set.
Reserved location. Written as zero and read as undefined.
Auto-Poll Preamble Suppression. If this bit is set to 1, the Auto-Poll State Machine will suppress
the preambles of the MII Management Frames that it uses to periodically read the external PHY
register selected by the AP_PHY4_ADDR and AP_REG4_ADDR fields.
This bit is ignored when the AP_PHY4_DFLT bit is set.
Auto-Poll PHY4 Default. When this bit is set, the Auto-Poll State Machine ignores the contents of
the AP_PHY4_ADDR and AP_PRE_SUP4 fields and uses the AP_PHY0_ADDR field for the
address of the PHY device to be polled. If this bit is set, the Auto-Poll State Machine will suppress
preambles only if the Port Manager has determined that the default external PHY can accept MII
Management Frames without preambles. (The Port Manager examines bit 6 in register 1 of the
default PHY to make this determination.)
Auto-Poll PHY4 Address. This field contains the address of the external PHY that contains
AP_REG4.
This bit is ignored when the AP_PHY4_DFLT bit is set.
Table 36. AUTOPOLL4: Auto-Poll4 Register
P R E L I M I N A R Y
Am79C976
All bits in this register are set to their default values by
H_RESET. All bits are also set to their default values
before EEPROM data are loaded or after an EEPROM
read failure.
The default value for all bits in this register is 0.
Description
129