CDA CD 60 Spezifikationen PDF herunterladen (Seite 87)

PCI CD and PCI CDa

Document Number: 008-00965-06 EDT Public December 2004

Template: edt.dot

Page 87

Direction Control Registers

Size 8-bit each

I/O read-write

Address A at 0x06, B at 0x07

Access PCD_DIRA and PCD_DIRB

Comments

These registers determine whether the physical drivers or receivers on the

interface are inputs or outputs. Each pin on the PCI CD can be programmed

as either an input or an output. Pins are normally configured for inputs or

outputs as documented in the connector pinout shown on page 65. The PCI

CD driver modifies the data bits appropriately for a read or write system call.

Setting the same pins to serve as both input and output is useful for testing.

Setting the same pins to serve as neither input nor output is not useful.

Direction Control Register A controls the data direction; Direction Control

For example, to implement the interface documented in the connector pinout

shown on page 65 for a write operation, set A to 0x0F and B to 0xCC. For a

read, set A to 0xF0 and B to 0xCC.

DC15 Pins 22 and 62 are outputs when this bit is low.

DC14 Pins 19, 59, 21, and 61 are outputs when this bit is low.

DC13 Pins 32–39 are outputs when this bit is low.

DC12 Pins 72–79 are outputs when this bit is low.

DC11 Pins 24–31 are outputs when this bit is low.

DC10 Pins 64–71 are outputs when this bit is low.

DC9 Pins 24–31 are inputs when this bit is low.

DC8 Pins 64–71 are inputs when this bit is low.

DC7 Pins 11–18 are outputs when this bit is low.

DC6 Pins 51–58 are outputs when this bit is low.

DC5 Pins 3–10 are outputs when this bit is low.

DC4 Pins 43–50 are outputs when this bit is low.

DC3 Pins 11–18 are inputs when this bit is low.

DC2 Pins 51–58 are inputs when this bit is low.

DC1 Pins 3–10 are inputs when this bit is low.

DC0 Pins 43–50 are inputs when this bit is low.

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CDA CD 60 Spezifikationen Seite 87