CS8900A datasheet(66/128 Pages) CIRRUS

66 / 128 page

DS271PP3

CS8900A

Crystal LAN™ ISA Ethernet Controller

CIRRUS LOGIC PRODUCT DATA SHEET

4.4.19 Register 16: Self Status

(SelfST, Read-only, Address: PacketPage base + 0136h)

SelfST reports the status of the EEPROM interface and the initialization process.

010110

These bits provide an internal address used by the CS8900A to identify this as the Chip Self

Status Register. When reading this register, these bits will be 010110, where the LSB corre-

sponds to Bit 0.

3,3VActive

If the CS8900A is operating on a 3.3V supply, this bit is set. If the CS8900A is operating on a

5V supply, this bit is clear.

INITD

If set, the CS8900A initialization, including read-in of the EEPROM, is complete.

SIBUSY

If set, the EECS output pin is high indicating that the EEPROM is currently being read or pro-

grammed. The host must not write to PacketPage base + 0040h nor 0042h until SIBUSY is

clear.

EEPROMpresent

If the EEDataIn pin is low after reset, there is no EEPROM present, and the EEPROMpresent

bit is clear. If the EEDataIn pin is high after reset, the CS8900A "assumes" that an EEPROM

is present, and this bit is set.

EEPROMOK

If set, the checksum of the EEPROM readout was OK.

ELpresent

If set, external logic for Latchable Address bus decode is present.

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).

Reset value is: 0000 0000 0001 0110

765

4321

INITD

3.3V Active

010110

DCBA

EEsize

ELPresent

EEPROM OK

EEPROM

present

SIBUSY

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