pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 310

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

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Host Controller Interface Modules
Shared Memory Core Override Write Protect Registers 0-2 (SMCOWP0-2)
SMCOWP0-2 are 16-bit registers that provide override on the host write protection bits. For the host to be able to write a
memory location, both the Host Write Protection bit (controlled through the Shared Memory Host Access Protect Register 1
or 2) and the associated bit in SMCOWP0-2 should be cleared. Each bit in this register is associated with a memory block,
as described in the bit description. Bits in these registers may be RO or RW depending on their position and the size of the
core and host boot blocks. These registers are cleared on reset and change in value of
Location: 00 F920
Type: R/W
Bit
Name
Reset
Bit
Name
Reset
Bit
Name
Reset
15-0 OWPLA15-0(Override Write Protect Low Addresses 15 through 0).
Bit
1. Use the MBTA as specified in SMCTA register, without the MBTA override in the protection word.
OWP15-2(Override Write Protect 15 through 2).
OWP31-16(Override Write Protect 15 through 0).
Each bit affects the host’s ability to write to one block. On the low addresses (covered by OWPLAi), the block
size is 8 Kbytes. For the other blocks it is 64 Kbytes. The block address is calculated as follows:
See Figure 102 on page 302 for a description of the block mapping. Bit 7 (OWPLA7) in SMCOWP0 register is
read only.
0: Do not override the host Write Protect setting for the block
1: Host writes for this block are disabled regardless of the setting of the respective bit in the host register
The following access limitations apply to the register’s bits:
Low Address Blocks, OWPLAi: from i*8K to (i+1)*8K 1
Other Blocks, OWPLj: from j*64K to (j+1)*64K
Core boot blocks that cover address 00 0000
Host boot blocks not in above group and ranging from (MBTA
All other blocks:
15
15
15
16
, 00 F922
14
14
14
13
13
13
16
, 00 F924
12
12
12
16
11
11
11
10
10
10
(Continued)
OWP15-2
9
9
9
16
Description
310
to CR_Boot_Block_Size:
OWPLA15-0
OWP 31-16
8
8
8
FFFF
FFFF
FFFF
16
16
16
7
7
7
1
6
6
6
Host_Boot_Block_Size) to MBTA:RO
5
5
5
SMCTA
4
4
4
.
3
3
3
2
2
2
Reserved
1
1
1
RO
RW
Revision 1.07
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