PC87591L datasheet(310/437 Pages) NSC

310 / 437 page

Host Controller Interface Modules (Continued)

www.national.com

310

Revision 1.07

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

SMCTA.

Location: 00 F92016, 00 F92216, 00 F92416

Type: R/W

Bit

9876

43210

Name

OWPLA15-0

Reset

FFFF16

Bit

9876

43210

Name

OWP15-2

Reserved

Reset

FFFF16

Bit

9876

43210

Name

OWP 31-16

Reset

FFFF16

Bit

Description

15-0 OWPLA15-0(Override Write Protect Low Addresses 15 through 0).

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:

Low Address Blocks, OWPLAi: from i*8K to (i+1)*8K

−1

Other Blocks, OWPLj: from j*64K to (j+1)*64K

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:

Core boot blocks that cover address 00 000016 to CR_Boot_Block_Size:

Host boot blocks not in above group and ranging from (MBTA1

− Host_Boot_Block_Size) to MBTA:RO

All other blocks:

1. Use the MBTA as speciﬁed in SMCTA register, without the MBTA override in the protection word.

PC87591L Datasheet(PDF) 310 Page - National Semiconductor (TI)

PC87591L Datasheet(HTML) 310 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL