Eeprom Revision; Manufacturing Date; Ieee Physical Address (Copy); 16-Bit Checksum - Cirrus Logic CRYSTAL LAN CS890 Technical Reference Manual

Specifies the presence of LA decode circuitry on the
adapter. Refer to Section 2.3.2.2.
ized by OEM before shipping adapter.)
Bit 3: Adapter Provides HW Standby Circuitry
Specifies the presence of hardware standby circuitry
on the adapter. Refer to Section 3.7 of the CS8900
Data Sheet .
(Must be initialized by OEM before
shipping adapter.)
Bit 2: Adapter Provides 10Base-2 Circuitry
Specifies the presence of 10Base-2 circuitry on the
adapter. (Must be initialized by OEM before ship-
ping adapter.)
Bit 1: Adapter Provides AUI Circuitry
Specifies the presence of AUI circuitry on the
adapter. (Must be initialized by OEM before ship-
ping adapter.)
Bit 0: Adapter Provides 10Base-T Circuitry
Specifies the presence of 10Base-T circuitry on the
adapter. (Must be initialized by OEM before ship-
ping adapter.)

3.1.3.8 EEPROM Revision

Specifes the revision level of the format
definition used by this EEPROM. A value of
0 indicates the first revison level, a value of 1
indcates the second revison level, and so on.

3.1.3.9 Manufacturing Date

This word is the adapter's manufacture date
encoded in 16 bits, YR-MO-DY format.
(Must be initialized by OEM before ship-
ping adapter.)
Bits 15-9: Two Least-significant Digits of Year
56
(Must be initial-
CS8900 Technical Reference Manual
Seven bits for a range of 00 to 99 decimal. A roll-
over to 00 will be interpreted as the year 2000.
Bits 8-5: Month
Four bits for a range of 01 to 12.
Bits 4-0 Day
Five bits for a range of 01 to 31.

3.1.3.10 IEEE Physical Address (copy)

This field is a copy of the three words at
address 1Ch to 1Eh. (Must be initialized
by OEM before shipping adapter.)

3.1.3.11 16-bit Checksum

The checksum stored at the end of the block
is the 2's complement of the 16-bit sum of all
the preceding words in the Driver Configu-
ration Block. (The drivers access the Con-
figuration Block as 16-bit words.) Any carry
out of the 16th bit is ignored. Since this
checksum value is calculated as the 2's
complement of the sum of all the preceding
words in the block, a total of 0 should result
when the checksum value is added to the
sum of the previous words. (Must be initial-
ized by OEM before shipping adapter.)

3.1.3.12 EISA ID

The two EISA words make up the 32-bit
EISA Product Identification Code.
Low Word
These 16 bits make up the 3-letter identifier string of
the OEM's EISA ID in 5-bit compressed ASCII. (A =
00001, B = 00010, C = 00011, etc.)
Bits 7-0: High order 8 bits of 16-bit value
Bits 15-8: Low order 8 bits of 16-bit value
AN83REV1