Freescale Semiconductor MPC8313E Family Reference Manual page 409

Bits Name
AP_ n _EN
8
9–11 ODT_RD_CFG
12 —
13–15 ODT_WR_CFG
16–17 BA_BITS_CS_ n
18–20 —
ROW_BITS_CS_ n Number of row bits for SDRAM on chip select n . See
21–23
24–28 —
29–31 COL_BITS_CS_ n
9.4.1.3 DDR SDRAM Timing Configuration 3 (TIMING_CFG_3)
DDR SDRAM timing configuration register 3, shown in
time, which is combined with TIMING_CFG_1[REFREC] to determine the full refresh recovery time.
MPC8313E PowerQUICC II Pro Integrated Processor Family Reference Manual, Rev. 3
Freescale Semiconductor
Table 9-7. CS n _CONFIG Field Descriptions (continued)
Chip select n auto-precharge enable
0 Chip select n is only auto-precharged if global auto-precharge mode is enabled
(DDR_SDRAM_INTERVAL[BSTOPRE] = 0).
1 Chip select n always issues an auto-precharge for read and write transactions.
ODT for reads configuration. Note that CAS latency plus additive latency must be at least
3 cycles for ODT_RD_CFG to be enabled. ODT should only be used with DDR2 or memories.
000 Never assert ODT for reads
001 Assert ODT only during reads to CS n
010 Assert ODT only during reads to other chip selects
011 Reserved
100 Assert ODT for all reads
101–111Reserved
Reserved
ODT for writes configuration. Note that write latency plus additive latency must be at least
3 cycles for ODT _WR_CFG to be enabled. ODT should only be used with DDR2 or memories.
000 Never assert ODT for writes
001 Assert ODT only during writes to CS n
010 Assert ODT only during writes to other chip selects
011 Reserved
100 Assert ODT for all writes
101–111Reserved
Number of bank bits for SDRAM on chip select n . These bits correspond to the sub-bank bits
driven on MBA n in Table 9-30.
00 2 logical bank bits
01 3 logical bank bits
10–11Reserved
Reserved
000 12 row bits
001 13 row bits
010 14 row bits
011 15 row bits
000–111 Reserved
Reserved
Number of column bits for SDRAM on chip select n. For DDR, the decoding is as follows:
000 8 column bits
001 9 column bits
010 10 column bits
011 11 column bits
100–111 Reserved
Description
Table 9-30
Figure 9-4, sets the extended refresh recovery
DDR Memory Controller
for details.
9-11