参数资料
型号: RCPXA270C0C520
厂商: MARVELL SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 520 MHz, MICROPROCESSOR, PBGA356
封装: 13 X 13 MM, 1 MM HEIGHT, 0.50 MM PITCH, VFBGA-356
文件页数: 105/128页
文件大小: 1560K
代理商: RCPXA270C0C520
6-14
Electrical, Mechanical, and Thermal Specification
Intel PXA270 Processor
AC Timing Specifications
tsdSDIS
MD<31:0> read
data input setup
time from
SDCLK<2:1> rise
TBD
——
0.5
——
0.5
——
ns
tsdSDIH
MD<31:0> read
data input hold
time from
SDCLK<2:1> rise
TBD
——
1.8
——
1.8
——
ns
NOTES:
1. SDCLK for SDRAM slowest period is accomplished by divide-by-2 of the 26-MHz CLK_MEM. The fastest possible SDCLK is
accomplished by configuring CLK_MEM at 104 MHz and not setting MDREFR[KxDB2].
2. SDCLK1 and SDCLK2 frequencies are configured to be CLK_MEM frequency divided by 1 or 2, depending on the bit fields
MDREFR[K1DB2] and MDREFR[K2DB2] settings.
3. These numbers are for VCC_MEM = 1.8 V +20% / –5%, VOL = 0.4 V, and VOH = 1.4 V, with each applicable 4-bit field of the
system memory buffer strength registers (BSCNTRP and BSCNTRN) set to TBD (msb:lsb) and each applicable SDCLK<2:1>
divide-by-2 and divide-by-4 register bits MDREFR[KxDB2] clear.
4. These numbers are for VCC_MEM = 2.5 V +/– 10%, VOL = 0.4 V, and VOH = 2.1 V, with each applicable 4-bit field of the system
memory buffer strength registers (BSCNTRP and BSCNTRN) set to 0b1010 (msb:lsb) and each applicable SDCLK<2:1> divide-
by-2 and divide-by-4 register bit MDREFR[KxDB2] clear.
5. These numbers are for VCC_MEM = 3.3 V +/– 10%, VOL = 0.4 V, and VOH = 2.4 V, with each applicable 4-bit field of the system
memory buffer strength registers (BSCNTRP and BSCNTRN) set to 0b1010 (msb:lsb) and each applicable SDCLK<2:1> divide-
by-2 and divide-by-4 register bit MDREFR[KxDB2] clear.
6. Refer to the “Memory Controller” chapter in the Intel PXA27x Processor Family Developer’s Manual for register configuration.
Table 6-15. SDRAM Interface AC Specifications (Sheet 2 of 2)
Symbols
Parameters
VCC_MEM =
1.8V +20% / –5%3
VCC_MEM =
2.5V +/- 10%4
VCC_MEM =
3.3V +/- 10%5
Units
Not
es
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
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