CDA CD 60 Podręcznik Użytkownika Pobierz pdf (Strona 13)

PCD8 8-bit DMA Interface User’s Guide Register Modifications

EDT, Inc. May 2007 10

The registers are as described in the PCI CD/CDa User’s Guide except for the changes described

below.

Command Register

In this register, bit 2 is different from its implementation in the PCI CD/CDa firmware.

Size 8-bit

I/O read-write

Address 0x00

Access PCD_CMD

Bit PCD_ Description

4–7 STAT_INT_EN A value of one enables the corresponding STAT bit to cause an interrupt when

it is asserted.

3 ENABLE Set to one to enable the PCD8 interface. This bit is set after the direction is

chosen and typically after the first DMA buffer is ready. To reset direction or

flags, toggle this bit.

To flush the DMA FIFOs, clear then set this bit.

2 INV When set, inverts the bits in each byte, so that ones become zeroes and zeroes

become ones.

1 FORCEBNR A value of 1indicates that the board is not ready.

0 DIR A value of 1 indicates that data is coming in to the PCD8.

A value of 0 indicates that data is going out from the PCD8.

1 2 ... 8 9 10 11 12 13 14

Brak uwag

CDA CD 60 Podręcznik Użytkownika Strona 13