National Instruments SCXI-1163 - Manual (Page 48)

Register Descriptions Chapter 4
SCXI-1163 User Manual 4-2 © National Instruments Corporation
Address Handler
You must write to the Address Handler at the beginning of each write to or read from the
SCXI-1163. Write the address of the register of interest to this handler, which in turn enables the
register. This register is two bytes long and contains the address of the register to be read from
or written to. The Address Handler is selected when SS* is asserted low and D*/A indicates an
address transfer (D*/A is high). At this time, the address is shifted in the Address Handler
register, MSB first. Table 4-1 lists the register addresses.
Table 4-1. SCXI-1163 Register Addresses
Address (Hexadecimal) Register
0000 Module ID Register
0001 Data Register A (enables serial override)
0002 Primary Mode Register
0003 Output Mode Register
0006 Data Register B (disables serial override)
FFFF Parking Register
After you have finished writing, the D*/A line goes low, indicating a data transfer to a register.
This enables the Address Handler output and selects the appropriate register.
You should select the Parking Register (write address FFFF to the Address Handler) after
communication with one of the other registers. This increases the noise immunity of the module
when the module is in its quiescent state.
After you select the Parking Register, SS* should be released high, which deselects the module
and latches all of the data.
At reset or at power up, the Address Handler content is cleared.