CS89712 datasheet(71/170 Pages) CIRRUS

71 / 170 page

CS89712

DS502PP2

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).

0x8000.0002

PBDR

Port B Data register

0x8000.0001

—

Reserved

0x8000.0000

PDDR

Port D Data register

0x8000.0043

PADDR

Port A data Direction register

0x8000.0042

PBDDR

Port B Data Direction register

0x8000.0041

—

Reserved

0x8000.0040

PDDDR

Port D Data Direction register

0x8000.0083

PEDR

Port E Data Register

0X8000.00C3

PEDDR

Port E Data Direction register

Big Endian Mode

Name

Default

RD/WR

Size

Comments

Table 32. CS89712 Internal Registers (Big Endian Mode)

Memory Location

Type

Description

0x2000.0300

Read/Write

Receive/Transmit Data (Port 0)

0x2000.0302

Read/Write

Receive/Transmit Data (Port 1)

0x2000.0304

Write-only

TxCMD (Transmit Command)

0x2000.0306

Write-only

TxLength (Transmit Length)

0x2000.0308

Read-only

Interrupt Status Queue

0x2000.030A

Read/Write

Ethernet Port Pointer

0x2000.030C

Read/Write

Ethernet Port Data (Port 0)

0x2000.030E

Read/Write

Ethernet Port Data (Port 1)

Table 33. Ethernet Port Register Window

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