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CS89712 データシート(PDF) 71 Page - Cirrus Logic |
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CS89712 データシート(HTML) 71 Page - Cirrus Logic |
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71 / 170 page  CS89712 DS502PP2 71 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 0 RW 8 Port B Data register 0x8000.0001 — — 8 Reserved 0x8000.0000 PDDR 0 RW 8 Port D Data register 0x8000.0043 PADDR 0 RW 8 Port A data Direction register 0x8000.0042 PBDDR 0 RW 8 Port B Data Direction register 0x8000.0041 — — 8 Reserved 0x8000.0040 PDDDR 0 RW 8 Port D Data Direction register 0x8000.0083 PEDR 0 RW 3 Port E Data Register 0X8000.00C3 PEDDR 0 RW 3 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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