Cirrus Logic AN83 - Manual (Page 48)

AN83
48 AN83REV3
23h Transmission Control
HDX/FDX
15 0 = Half-Duplex, 1 = Full-Duplex
Reserved 14-7 Reserved for future use, set to 0
Ignore Missing Media 6 0 = Media required for driver to load, 1 = media not required
Reserved 5-0 Reserved for future use, set to 0
24h Adapter Configuration
Ext. 10B-2 Cable Circuitry
15 0 = Not Present, 1 = Present
LoRx Squelch 14 0 = LoRx Squelch disabled, 1 = LoRx Squelch enabled
PolarityDis 13 0 = polarity correction enabled, 1 = pol. correction disabled
24h Adapter Configuration (Continued)
Optimization Flags 12-11 00 = Server, 01 = DOS Client, 10 = Multi-OS Client
Reserved 10-8 Reserved for future use, set to 0
DC/DC Converter Polarity 7 0 = Low enable, 1 = High enable
Media Type in Use 6-5 0 = Auto Detect, 1 = 10BASE-T, 2 = AUI, 3 = 10BASE-2
LA Decode Circuitry 4 0 = Not Present, 1 = Present (Req’d for decode above 1MB)
HW Standby 3 0 = HW Standby not supported, 1 = HW Standby supported
10BASE-2 Circuitry 2 0 = Not Present, 1 = Present
AUI Circuitry 1 0 = Not Present, 1 = Present
10BASE-T Circuitry 0 0 = Not Present, 1 = Present
25h EEPROM Revision 15-0 Revision number of the EEPROM format definition used
26h Reserved 15-0 Reserved for future use, set to 0
27h Mfg Date
Year
15-9 e.g. 1011111b = 1995, 0000001b = 2001
Month 8-5 e.g. 1b = Jan, 1100b = Dec
Day 4-0 e.g. 1b = 1, 11111b = 31
28-2Ah IEEE Individual Addr 47-0 Copy of words at 1C-1Eh
2Bh Reserved 15-0 Reserved for future use, set to 0
2Ch Reserved 15-0 Reserved for future use, set to 0
2Dh Reserved 15-0 Reserved for future use, set to 0
2Eh Reserved 15-0 Reserved for future use, set to 0
2Fh Checksum 15-0 Word-wide checksum of words 1Ch to 2Fh (zero sum)
30h EISA ID (low word) 15-0 EISA ID bits[7-0], EISA ID bits[15-8]
31h EISA ID (high word) 15-0 EISA ID bits[23-16], EISA ID bits[31-24]
32h Serial No (low word) 15-0 32-bit OEM assigned serial number, bits[15-8], bits[7-0]
33h Serial No (high word) 15-0 32-bit OEM assigned serial number, bits[31-24], bits[23-16]
34h Serial ID Checksum
Marker Byte
15-8 Constant 0Ah in high byte of checksum word
LFSR Checksum 7-0 8-bit LFSR checksum of words 30h to 33h
Addr. Description Bit(s) Function
Table 8. EEPROM Driver Configuration Block