Texas Instruments DM648 DSP - Manual (Page 37)

www.ti.com
4.1 Module ID and Revision Register (MIDR)
4.2 DDR2 Memory Controller Status Register (DMCSTAT)
DDR2 Memory Controller Registers
The Module ID and Revision register (MIDR) is shown in Figure 20 and described in Table 18 .
Figure 20. Module ID and Revision Register (MIDR)
31 30 29 16
Reserved MOD_ID
R-0x0 R-0x0031
15 8 7 0
MJ_REV MN_REV
R-0x03 R-0x0F
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 18. Module ID and Revision Register (MIDR) Field Descriptions
Bit Field Value Description
31-30 Reserved Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
29-16 MOD_ID Module ID bits.
15-8 MJ_REV Major revision.
7-0 MN_REV Minor revision.
The DDR2 memory controller status register (DMCSTAT) is shown in Figure 21 and described in
Table 19 .
Figure 21. DDR2 Memory Controller Status Register (DMCSTAT)
31 30 29 16
Rsvd Rsvd Reserved
R-0x0 R-0x1 R-0x0
15 3 2 1 0
Reserved IFRDY Reserved
R-0x0 R-0x0 R-0x0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 19. DDR2 Memory Controller Status Register (DMCSTAT) Field Descriptions
Bit Field Value Description
31 Reserved 0 Reserved. The value always should be written as 0. write of 1 results an error in functionality.
30 Reserved 1 Reserved. The reserved bit location is always read as 1. A value written to this field has no effect.
29-3 Reserved 0 Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
2 IFRDY DDR2 memory controller interface logic ready bit. The interface logic controls the signals used to
communicate with DDR2 SDRAM devices. This bit displays the status of the interface logic.
0 Interface logic is not ready; either powered down, not ready, or not locked.
1 Interface logic is powered up, locked, and ready for operation.
1-0 Reserved 0 Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
SPRUEK5A – October 2007 DSP DDR2 Memory Controller 37
Submit Documentation Feedback