MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 338

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DDR Memory Controller
Table 9-8
9.4.1.4
DDR SDRAM timing configuration register 0, shown in
between various SDRAM control commands.
Table 9-9
9-14
13–15
16–31
Offset 0x104
Reset 0 0
0–12
Bits
Bits
0–1
W
R
RWT WRT RRT
0
EXT_REFREC
1
describes TIMING_CFG_3 fields.
describes TIMING_CFG_0 fields.
Name
Name
0 0 0
2
RWT
DDR SDRAM Timing Configuration 0 (TIMING_CFG_0)
—
—
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
3 4
Figure 9-5. DDR SDRAM Timing Configuration 0 (TIMING_CFG_0)
0
5
Read-to-write turnaround (t
write turnaround. If 0 clocks is chosen, then the DDR controller will use a fixed number based on the
CAS latency and write latency. Choosing a value other than 0 adds extra cycles past this default
calculation. As a default the DDR controller will determine the read-to-write turnaround as CL – WL
+ BL/2 + 2. In this equation, CL is the CAS latency rounded up to the next integer, WL is the
programmed write latency, and BL is the burst length.
00 0 clocks
01 1 clock
Reserved, should be cleared.
Extended refresh recovery time (t
until an activate command is allowed. This field is concatenated with TIMING_CFG_1[REFREC] to
obtain a 7bit value for the total refresh recovery. Note that hardware adds an additional 8 clock cycles
to the final, 7bit value of the refresh recovery. t
is calculated as follows:
000 0 clocks
001 16 clocks
010 32 clocks
011 48 clocks
100 64 clocks
101 80 clocks
110 96 clocks
111 112 clocks
Reserved, should be cleared.
WWT — ACT_PD_EXIT — PRE_PD_EXIT
0
6
0
7
Table 9-8. TIMING_CFG_3 Field Descriptions
8
0
Table 9-9. TIMING_CFG_0 Field Descriptions
0
9
0
11
1
RTW
12
0
). Specifies how many extra cycles will be added between a read to
RFC
13
0
). Controls the number of clock cycles from a refresh command
0
Figure
Description
Description
15
1
RFC
16
0 0 0 0
9-5, sets the number of clock cycles
10 2 clocks
11 3 clocks
= {EXT_REFREC || REFREC} + 8, such that t
—
19 20
ODT_PD_EXIT
0
0
0
23 24
1
Freescale Semiconductor
0 0 0 0 0 1 0 1
Access: Read/Write
—
27 28
MRS_CYC
RFC
31