LH79520_N NXP Semiconductors, LH79520_N Datasheet - Page 37

• Manufacturer Part Number: LH79520_N
• Description: The LH79520, powered by an ARM720T, is a completeSystem-on-Chip with a high level of integration tosatisfy a wide range of requirements and expectations
• Manufacturer: NXP Semiconductors

System-on-Chip
SDRAM Memory Controller Waveforms
SDRAM Burst Read (page already open). Figure 17
shows the waveform and timing for SDRAM to Activate
a Bank and Write.
Preliminary data sheet
NOTES:
1. SDRAMcmd is the combination of nRAS, nCAS, nSDWE, and nSDCS(X).
2. tOVXXX represents tOVRA, tOVCA, tOVSDW, or tOVSC.
3. tOHXXX represents tOHRA, tOHCA, tOHSDW, or tOHSC.
4. nDQM is LOW.
5. SDCKE is HIGH.
SDRAMcmd
NOTES:
1. SDRAMcmd is the combination of nRAS, nCAS, nSDWE, and nSDCS(X).
2. tOVXXX represents tOVRA, tOVCA, tOVSDW, or tOVSC. Refer to the AC timing table.
3. tOHXXX represents tOHRA, tOHCA, tOHSDW, or tOHSC.
4. nDQM is LOW.
Figure 16 shows the waveform and timing for an
SDRAMcmd
A[15:0]
D[31:0]
SCLK
SDCKE
D[31:0]
A[15:0]
SCLK
t SDCLK
tSDCLK
Figure 17. SDRAM Bank Activate and Write
t OVXXX
tOVA
READ
Figure 16. SDRAM Burst Read
COLUMN
BANK,
t OHXXX
t OV
tOVC0
Rev. 01 — 16 July 2007
NXP Semiconductors
tOVA
tOVXXX
ACTIVE
tISD tIHD
tOVA
BANK,
tOHXXX
ROW
DATA n
DATA n + 1
DATA n + 2
DATA n + 3
tOVD
WRITE
COLUMN
DATA
BANK,
tOHD
LH79520
LH79520-35
79520-36
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