ADLINK Technology cPCI-7300A, User Manual

Page: 32 / 114

22 Registers
3.2 DI_CSR: DI Control & Status Register
Digital input control and status checking is done by this register.
Address: BASE + 00
Attribute: READ/WRITE
Data Format:
DI_32 (R/W)
X
0:Input port is not 32-bit wide (16-bit or 8-bit wide)
X 1:Input port is 32-bit wide, PORTB is configured as the
extension of PORTA. That means PORTA is input lines
0…15, and PORTB is input lines 16…31. All the PORTB
control signals are disabled.
DI_CLK_SEL (R/W)
X 00: use timer0 output as input clock
X 01: use 20MHz clock as input clock
X 10: use 10MHz clock as input clock
X 11: use external clock (DI_REQ) as input clock
DI_HND_SHK (R/W)
X 0: No handshaking
X 1: REQ/ACK handshaking mode
DI_WAIT_TRIG (R/W)
X 0: start input sampling immediately
X 1: delay input sampling until DITRIG is active
PA_TERM_OFF (R/W)
X 0: PORTA terminator ON
X 1: PORTA terminator OFF
Bit # 3-0 DI_HND_SHK DI_CLK_SEL DI_32
Bit # 7-4 0 PA_TERM_OFF DI_WAIT_TRIG -- (1)
Bit # 11-8 DI_FIFO_FULL DI_OVER DI_FIFO_CLR DI_EN
Bit # 15-12 - - - DI-FIFO_EMPTY
Bit # 31-16 Don’t Care