Floating Point Digital Signal Processor Specification Sheet
SPRS293A − OCTOBER 2005 − REVISED NOVEMBER 2005
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CPU CSR register description (continued)
Table 17. CPU CSR Register Bit Field Description
BIT # NAME DESCRIPTION
31:24 CPU ID
CPU ID + REV ID. Read only.
Identifies which CPU is used and defines the silicon revision of the CPU.
23:16 REVISION ID
Identifies which CPU is used and defines the silicon revision of the CPU.
CPU ID + REVISION ID (31:16) are combined for a value of: 0x0203
15:10 PWRD
Control power-down modes. The values are always read as zero.
000000 = no power-down (default)
001001 = PD1, wake-up by an enabled interrupt
010001 = PD1, wake-up by an enabled or not enabled interrupt
011010 = PD2, wake-up by a device reset
011100 = PD3, wake-up by a device reset
Others = Reserved
9 SAT
Saturate bit.
Set when any unit performs a saturate. This bit can be cleared only by the MVC instruction and can
be set only by a functional unit. The set by the a functional unit has priority over a clear (by the MVC
instruction) if they occur on the same cycle. The saturate bit is set one full cycle (one delay slot) after
a saturate occurs. This bit will not be modified by a conditional instruction whose condition is false.
8 EN
Endian bit. This bit is read-only.
Depicts the device endian mode.
0 = Big Endian mode.
1 = Little Endian mode [default].
7:5 PCC
Program Cache control mode.
L1D, Level 1 Program Cache
000/010 = Cache Enabled / Cache accessed and updated on reads.
All other PCC values reserved.
4:2 DCC
Data Cache control mode.
L1D, Level 1 Data Cache
000/010 = Cache Enabled / 2-Way Cache
All other DCC values reserved
1 PGIE
Previous GIE (global interrupt enable); saves the Global Interrupt Enable (GIE) when an interrupt is
taken. Allows for proper nesting of interrupts.
0 = Previous GIE value is 0. (default)
1 = Previous GIE value is 1.
0 GIE
Global interrupt enable bit.
Enables (1) or disables (0) all interrupts except the reset interrupt and NMI (nonmaskable interrupt).
0 = Disables all interrupts (except the reset interrupt and NMI) [default]
1 = Enables all interrupts (except the reset interrupt and NMI)