Instruction manual
7.3.4 Printer Port Transmit DMA Pointer—NA/ 1.E004.0050
Unused in 300 models. This pointer points to the word containing the next byte
to be transmitted through the printer port. The register’s format and contents
are:
Bits Access Reset Function
4:0 R/W UNP DMA physical address <33:29>
31:5 R/W UNP DMA physical address <28:2>
7.3.5 Printer Port Receive DMA Pointer—NA/1.E004.0060
Unused in 300 models. This pointer points to the word to contain the next byte to
be received from the printer port. The register’s format and contents are:
Bits Access Reset Function
4:0 R/W UNP DMA physical address <33:29>
31:5 R/W UNP DMA physical address <28:2>
7.3.6 ISDN Transmit DMA Pointer—1.A004.0080/1.E004.0080
This is the address used by the ISDN DMA when it transmits data from main
memory. The contents of this register are undefined at power up and must be
loaded with the appropriate value before DMA.
The register’s format and contents are:
Bits Access Reset Function
4:0 R/W UNP DMA physical address <33:29>
31:5 R/W UNP DMA physical address <28:2>
7.3.7 ISDN Transmit DMA Buffer Pointer—1.A004.0090/1.E004.0090
This is the address to be loaded into the ISDN DMA Pointer when the Pointer
reaches a page (4 KB) boundary. This register is undefined at power up and must
be loaded with the appropriate value before DMA.
The register’s format and contents are:
Bits Access Reset Function
4:0 R/W UNP DMA physical address <33:29>
31:5 R/W UNP DMA physical address <28:2>
7–8 IOCTL ASIC and System Registers