
Electrical, Mechanical, and Thermal Specification
6-25
Intel PXA270 Processor
AC Timing Specifications
tffSDIS
MD<31:0> read
data input setup
time from
SDCLK<2:0> rise
TBD
—
0.5
—
0.5
—
ns
—
tffSDIH
MD<31:0> read
data input hold time
from SDCLK<2:0>
rise
TBD
—
1.8
—
1.8
—
ns
—
NOTES:
1. SDCLK0 may be configured to be CLK_MEM divided by 1, 2 or 4. SDCLK0 for synchronous flash memory can be at the slowest,
divide-by-4 of the 26-MHz CLK_MEM. The fastest possible SDCLK0 is accomplished by configuring CLK_MEM at 104 MHz and
clearing the MDREFR[K0DB2] or MDREFR[K0DB4] bit fields.
2. SDCLK0 frequency equals CLK_MEM frequency (MDREFR[K0DB4] and MDREFR[K0DB2] bit fields are clear)
3. SDCLK0 frequency equals CLK_MEM/2 frequency (MDREFR[K0DB2] is set and MDREFR[K0DB4] is clear).
4. SDCLK0 frequency equals CLK_MEM/4 frequency (MDREFR[K0DB4] is set).
5. Use SXCNFG[SXCLx] to configure the value for the frequency configuration code (FCC).
6. 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 (BSCN TRP and BSCNTRN) set to TBD (msb:lsb) and each applicable SDCLK0 divide-
by-2 and divide-by-4 register bits (MDREFR[K0DB2] and MDREFR[K0DB4]) clear. If MDREFR[K0DB2 is set, the corresponding
output setup and hold times are increased and decreased, respectively, by 0.25 times the SDCLK0 period.
7. 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 SDCLK0 divide-by-2
and divide-by-4 register bit (MDREFR[K0DB2] and MDREFR[K0DB4]) clear. If MDREFR[K0DB2 is set, the corresponding output
setup and hold times are increased and decreased, respectively, by 0.25 times the SDCLK0 period.
8. 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 SDCLK0 divide-by-2
and divide-by-4 register bit (MDREFR[K0DB2] and MDREFR[K0DB4]) clear. If MDREFR[K0DB2 is set, the corresponding output
setup and hold times are increased and decreased, respectively, by 0.25 times the SDCLK0 period.
Table 6-17. Synchronous Flash Read AC Specifications (Sheet 2 of 2)
Symbols
Parameters
MIN
TYP
MAX MIN
TYP
MAX
MIN
TYP
MAX
Units
No
tes