ADLINK cPCI-7300 - Manual (Page 31)

Registers • 23
3.8 FIFO_CR: FIFO almost empty/full register
The register is used to control the FIFO programmable almost empty/full flag.
Address: BASE + 0x018
Attribute: WRITE Only
Data Format:
Bits 7 6 5 4 3 2 1 0
Bit 15~0 PB_PAE_PAF
Bit 31_16 PA_PAE_PAF
PB_PAE_PAF (WO)
Programmable almost empty/full threshold of PORTB FIFO, 2
consecutive writes are required to program PORTB FIFO.
Programmable almost empty threshold first.
PA_PAE_PAF(WO)
Programmable almost empty/full threshold of PORTA FIFO, 2
consecutive writes are required to program PORTA FIFO.
Programmable almost empty threshold first.
3.9 POL_CNTRL: Control Signal Polarity Control
Register
The register is used to control the control signals’ polarity. The control signals
include DI_REQ, DI_ACK, DI_TRG, DO_REQ, DO_ACK and DO_TRG.
Please note that this register is for PCI-7300A Rev.B and cPCI-7300 only.
Address: BASE + 0x1C
Attribute: READ/WRITE
Data Format:
Bit # 3~0 DO_REG_NEG DI_TRG_NEG DI_ACK_NEG DI_REQ_NEG
Bit # 71~4 - - DO_TRG_NEG DO_ACK_NEG
Bit # 31~8 Don’t Cared
DI_REQ_NEQ (R/W)
0: DI_REQ is rising edge active
1: DI_REQ is falling edge active