CS89712 Datasheet, PDF (71/170 Pages) Cirrus Logic – HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH 10BASE-T ETHERNET CONTROLLER

CS89712
Big Endian Mode
0x8000.0002
0x8000.0001
0x8000.0000
0x8000.0043
0x8000.0042
0x8000.0041
0x8000.0040
0x8000.0083
0X8000.00C3
Name
PBDR
—
PDDR
PADDR
PBDDR
—
PDDDR
PEDR
PEDDR
Default
0
0
0
0
0
0
0
RD/WR
RW
—
RW
RW
RW
—
RW
RW
RW
Size
8
8
8
8
8
8
8
3
3
Comments
Port B Data register
Reserved
Port D Data register
Port A data Direction register
Port B Data Direction register
Reserved
Port D Data Direction register
Port E Data Register
Port E Data Direction register
Table 32. CS89712 Internal Registers (Big Endian Mode)
1. The following register descriptions refer to Little Endian Mode Only.
3.2 Accessing Ethernet Port Registers
Registers for the Ethernet port are accessed through
two memory ranges; first, a 16-byte window of
eight 16-bit registers (shown in Figure 33) located
at address 0x2000.0300; and additional registers in
a 4 Kbyte internal memory page listed in Figure 36.
The registers at 0x2000.0300 are always immedi-
ately accessable, however registers mapped into
the 4 Kbyte page must be accessed through an in-
dex using the Ethernet Port pointer and Ethernet
Data Ports.
This is done by writing the offset of the target reg-
ister to the Ethernet Port Pointer. For example, the
EEPROM data register has an offset of 0042h. The
contents of the target register are then mapped into
the Ethernet Data Port.
If the software needs to access a sequential block of
registers, the MSB of the Ethernet Port address of
the first word to be accessed should be set to "1".
The Ethernet Port Pointer will then move to the
next word location automatically, eliminating the
need to setup the Ethernet Port Pointer between
successive accesses (see Figure 22).
Memory Location
0x2000.0300
0x2000.0302
0x2000.0304
0x2000.0306
0x2000.0308
0x2000.030A
0x2000.030C
0x2000.030E
Type
Read/Write
Read/Write
Write-only
Write-only
Read-only
Read/Write
Read/Write
Read/Write
Description
Receive/Transmit Data (Port 0)
Receive/Transmit Data (Port 1)
TxCMD (Transmit Command)
TxLength (Transmit Length)
Interrupt Status Queue
Ethernet Port Pointer
Ethernet Port Data (Port 0)
Ethernet Port Data (Port 1)
Table 33. Ethernet Port Register Window
DS502PP2
71