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BBus slave and DMA interface
704
NS9750 Hardware Reference
Core Phase (IEEE1284) register
Address: 9040 0178
Register bit assignment
Bits Access Mnemonic Reset Description
D31:08 R Reserved 0x0 N/A
D07:00 R pha 0x0 0x00spp forward idle
0x01 spp forward data transfer
0x0f spp reset
0x14 negotiate phase
0x18 terminate phase
0x24 nibble/byte reverse idle
0x26 nibble/byte reverse data transfer (see Warning
below)
0x28 nibble/byte host busy data not available
0x2C nibble/byte host busy data available
0x2E nibble/byte host interrupt
0x30 ecp forward idle
0x31 ecp forward data transfer
0x34 ecp reverse idle
0x36 ecp reverse data transfer
0x38 ecp host recovery
0x3C ecp reverse to forward phase transition
0x3E ecp forward to reverse phase transition
0x3F ecp setup phase
Table 413: Core Phase register
pha
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved
Reserved