ADLINK cPCI-7300 - Manual (Page 25)

Registers • 17
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:
Bit # 3~0 DI_HND_SHK DI_CLK_SEL DI_32
Bit # 7~4 0
PA_TERM_OF
F DI_WAIT_TRI
G
-- (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 Cared
(1) This bit is different between Rev.A and Rev.B.
DI_32 (R/W)
0: Input port is not 32-bit wide (16-bit or 8-bit wide)
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)
00: use timer0 output as input clock
01: use 20MHz clock as input clock
10: use 10MHz clock as input clock
11: use external clock (DI_REQ) as input clock
DI_HND_SHK (R/W)
0: No handshaking
1: REQ/ACK handshaking mode
DI_WAIT_TRIG (R/W)
0: start input sampling immediately
1: delay input sampling until DITRIG is active
PA_TERM_OFF (R/W)
0: PORTA terminator ON
1: PORTA terminator OFF
DI_EN (R/W)
0: Disable digital inputs
1: Enable digital inputs