Intel PXA255 User Manual
Page 257
Intel® PXA255 Processor Developer’s Manual
6-75
Memory Controller
Figure 6-34. SMROM Boot Time Configurations and Register Defaults
BOOT_SEL[2:0] = 100
SMROM
32-bit
32
MSC0
SXCNFG
7FF0 7FF0
0004 4531
SXEN0 = 1h, SXCL0 = 4h (CL = 5),
SXRL0 = 1h (RL = 2), SXRA0 = 1h (13-bits),
SXCA0 = 1h (8-bits), SXTP0 = 0h, SXLATCH=1h
RBW0 = 0
MRS value must be 0061h.
BOOT_SEL[2:0] = 101
SMROM
16-bit
16
MSC0
SXCNFG
7FF0 7FF8
0004 4931
SXEN0 = 1h, SXCL0 = 4h (CL = 5),
SXRL0 = 1h (RL = 2), SXRA0 = 1h (13-bits),
SXCA0 = 2h (9-bits), SXTP0 = 0h, SXLATCH=1h
RBW0 = 1
MRS value must be 0061h.
The number of banks in the device defaults to zero.
The number of banks in the device defaults to zero.
MDREFR
03CA 7FFF
E0PIN = 1, K0RUN = 1
MDREFR
03CA 7FFF
E0PIN = 1, K0RUN = 1
(64 Mbit)
(nWORD = 1)
or
SMROM
16-bit
(32 Mbit)
(nWORD = 0)
SMROM
16-bit
(32 Mbit)
(nWORD = 0)
16
16
32
(64 Mbit)
(nWORD = ‘0’)
BOOT_SEL[2:0] = 100
BOOT_SEL[2:0] = 101
SXMRS
SXMRS
0232 0232
0232 0232
BOOT_SEL[2:0] = 110
BOOT_SEL[2:0] = 111
SXMRS
SXMRS
0232 0232
0232 0232