CS8920A View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CS8920A' PDF : 144 Pages View PDF
CS8920A
Register 16: Self Status (SelfST, Read-only)
Address: PacketPage base + 0136h
F
E
D
C
B
A
9
8
EEsize
EEPROM EEPROM SIBUSY
OK
present
SelfST reports the status of the EEPROM interface and the initialization process.
7
INITD
6
PnP
Disable
5-0
010110
BIT NAME
DESCRIPTION
5-0 010110
These bits provide an internal address used by the CS8920A to identify this as the
Chip Self Status Register. When reading this register, these bits will be 010110, where
the LSB corresponds to Bit 0.
6
PnP Disable Indicates that the PnP section has been disabled by a bit in the EEPROM. This
disabling feature may be needed if the CS8920A is to look like a legacy device.
7
INITD
When set, the CS8920A initialization, including read-in of the EEPROM, is complete.
8
SIBUSY
When set, the EECS output pin is high indicating that the EEPROM is currently being
read or programmed. The host must not write to PacketPage base + 0040h nor 0042h
until SIBUSY is clear.
9
EEPROM
present
When the EEDI pin is low after reset, there is no EEPROM present, and the
EEPROMpresent bit is clear. If the EEDI pin is high after reset, the CS8920A
"assumes" that an EEPROM is present, and this bit is set.
A
EEPROMOK When set, the checksum of the EEPROM readout was OK.
C EEsize
This bit shows the size of the attached EEPROM and is valid only if the
EEPROMpresent bit (Bit 9) and EEPROMOK bit (Bit A) are both set. If clear, the
EEPROM size is either 128 words (’C56 or ’CS56) or 256 words (C66 or ’CS66). If set,
the EEPROM size is 64 words (’C46 or ’CS46).
This register’s initial state after reset is: (X = Depends on Configuration.) 000X XXXX XX01 0110
DS238PP2
65
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