CRD8900-1 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CRD8900-1 Datasheet PDF : 132 Pages
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CS8900
allocation, only one receive frame (starting at
PacketPage base + 0400h) and one transmit
frame (starting at PacketPage base + 0A00h) are
directly accessible. See Section 4.7.
4.2 PacketPage Memory Map
Table 4.1 shows the CS8900 PacketPage memory
address map:
PacketPage # of
Address Bytes
Type
Description
Cross
Reference
Bus Interface Registers
0000h
4
Read-only
Product Identification Code
Section 4.3
0004h
28
-
Reserved
Note 2
0020h
2
Read/Write
I/O Base Address
Sections 4.3, 4.10
0022h
2
Read/Write
Interrupt Number (0, 1, 2, or 3)
Sections 3.2, 4.3
0024h
2
Read/Write
DMA Channel Number (0, 1, or 2)
Sections 3.2, 4.3
0026h
2
Read-only
DMA Start Of Frame
Sections 4.3, 5.4
0028h
2
Read-only
DMA Frame Count (12 bits)
Sections 4.3, 5.4
002Ah
2
Read-only
RxDMA Byte Count
Sections 4.3, 5.4
002Ch
4
Read/Write
Memory Base Address Register (20 bit)
Sections 4.3, 4.9
0030h
4
Read/Write
Boot PROM Base Address
Sections 3.6, 4.3
0034h
4
Read/Write
Boot PROM Address Mask
Sections 3.6, 4.3
0038h
8
-
Reserved
Note 2
0040h
2
Read/Write
EEPROM Command
Sections 3.5, 4.3
0042h
2
Read/Write
EEPROM Data
Sections 3.5, 4.3
0044h
12
-
Reserved
Note 2
0050h
2
Read only
Received Frame Byte Counter
Sections 4.3, 5.2.9
0052h
174
-
Reserved
Note 2
Status and Control Registers
0100h
32 Read/Write
Configuration & Control Registers (2 bytes per register)
Section 4.4
0120h
32
Read-only
Status & Event Registers (2 bytes per register)
Section 4.4
0140h
4
-
Reserved
Note 2
Initiate Transmit Registers
0144h
2
Write-only
TxCMD (transmit command)
Sections 4.5, 5.7
0146h
2
Write-only
TxLength (transmit length)
Sections 4.5, 5.7
0148h
8
-
Reserved
Note 2
Address Filter Registers
0150h
8
Read/Write
Logical Address Filter (hash table)
Sections 4.6, 5.3
0158h
6
Read/Write
Individual Address
Sections 4.6, 5.3
015Eh
674
-
Reserved
Note 2
Frame Location
0400h
2
Read-only
RxStatus (receive status)
Sections 4.7, 5.2
0402h
2
Read-only
RxLength (receive length, in bytes)
Sections 4.7, 5.2
0404h
2
Read-only
Receive Frame Location
Sections 4.7, 5.2
0A00h
2
Read/Write
Transmit Frame Location
Sections 4.7, 5.7
NOTES: 1. All registers are accessed as words only.
2. Read operation from the reserved location pro-
vides undefined data. Writing to a reserved location or
undefined bits may result in unpredictable operation of the CS8900.
Table 4.1 PacketPage Memory Address Map
DS150PP2
37
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