Motorola MVME172 - Manual (Page 246)

4-10 Computer Group Literature Center Web Site
IP2 Chip
4
Programming Model
This section defines the programming model for the control and status
registers (CSRs) in the IP2 chip. The base address of the CSRs is
hardwired to $FFFBC000.
The possible operations for each bit in the CSR are as follows:
The possible states of the bits after assertion of the RESET* pin (powerup
reset or any local reset) are as defined below.
A summary of the IP2 chip CSR registers is shown in Table 4-3. The CSR
registers can be accessed as bytes, words, or longwords. They should not
be accessed as lines. They are shown in the table as bytes, and the bits in
most of the following register descriptions are labeled as bits 7 through 0.
R This bit is a read-only status bit.
R/W This bit is readable and writable.
R/C This status bit is cleared by writing a one to it.
C Writing a zero to this bit clears this bit or another bit.
This bit reads as zero.
S Writing a one to this bit sets this bit or another bit. This
bit reads as zero.
R The bit is affected by reset.
X The bit is not affected by reset.