Packetpage Memory Base; Boot Prom Memory Base; Boot Prom Mask; Transmission Control - Cirrus Logic CRYSTAL LAN CS890 Technical Reference Manual

3.1.3.3 PacketPage Memory Base

Bits 15-4: 12 MSB of Memory Base Address
The twelve most significant bits of the 24-bit address
locating the base of the CS8900's PacketPage
memory. The lower twelve bits are assumed to be 0.
Default is 0.
Bits 3-0: Reserved (set to 0)

3.1.3.4 Boot PROM Memory Base

Bits 15-4: 12 MSB of Memory Base Address
The twelve most significant bits of the 24-bit address
locating the base of the CS8900's PacketPage
memory. The lower twelve bits are assumed to be 0.
Default is 0.
Bits 3-0: Reserved (set to 0)

3.1.3.5 Boot PROM Mask

Bits 15-4: 12 MSB of Boot PROM Addr. Mask
Twelve-bit Boot PROM address mask. The lower
twelve bits are assumed to be 0. Refer to Section
3.6 of the CS8900 Data Sheet for a discussion of the
Boot PROM mask. Default is 0.
Bits 3-0: Reserved (set to 0)

3.1.3.6 Transmission Control

Bit 15: Full Duplex Mode
Specifies full-duplex or half-duplex mode for trans-
mission. Default is 0 (half-duplex operation).
Bits 14-7: Reserved (set to 0)
Bit 6: Ignore Missing Media (IMM)
Specifies device driver's behavior if a cable or AUI is
not connected during driver initialization.
driver's behavior can be summarized by the follow-
ing four cases. Default is 0.
AN83REV1
CS8900 Technical Reference Manual
CASE 1. (IMM = 0, media autodetect selected, cable
not connected)
Driver disables TX/RX and unloads if d y-
namic load/unload is supported by OS.
CASE 2. (IMM = 0, media type specified
[10B-T,AUI,10B-2], cable not connected)
Driver disables TX/RX and unloads if d y-
namic load/unload is supported by OS.
CASE 3. (IMM = 1, media autodetect selected, cable
not connected)
Driver disables TX/RX and unloads if d y-
namic load/unload is supported by OS.
CASE 4. (IMM = 1, media type specified
[10B-T,AUI,10B-2], cable not connected)
Driver remains resident, reports "Media type
XXXX not detected", and functions normally
if/when the specified cable type is connected.
Bits 5-0: Reserved (set to 0)

3.1.3.7 Adapter Configuration Word

Bits 15-13: Reserved (set to 0)
Bits 12-11: Optimization Flags
Used to specify the platform's OS configuration to
the driver. Each driver configures the CS8900 for
optimum performance based on the platform's OS
and driver architecture (NDIS 2X, ODI, NDIS 3X,
etc.). Default is DOS (single threaded OS).
Bits: 10-8: Reserved (set to 0)
Bit 7: DC to DC Converter Polarity
Refer to Section 2.2.2.9. (Must be initialized by OEM
before shipping adapter.)
Bit 6-5: Media Type In Use
Specifies the type of media the driver should use
The
(10Base-T, AUI, 10Base-2) or if driver should auto-
detect media in use. Default is auto-detect.
Bit 4: Adapter Provides LA Decode Circuitry
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