Texas Instruments OMAP5910, Technical Reference Manual

Page: 1053 / 1209

OMAP5910 Local Bus MMU
14-108
Table 14–58. Local Bus MMU TLB Read/Write Register
Access
Hardware
Reset
Bit Name Function
User Sup
Reset
Value
15–2 Reserved Reserved – – –
1 Rd_tlb_item When this bit is set, causes the TLB
data pointed to by the lock counter to
be read. Writing a 0 has no effect.
Always reads as 0. R/W R/W 0
0 Ld_tlb_item When this bit is set, causes the TLB to
be written. Writing a 0 has no effect.
Always reads as 0 R/W R/W 0
The LB MMU content addressable memory (CAM) access registers can be
used to access data in the local bus MMU content addressable memory. The
VA_tag values are compared against the local bus virtual address when a local
bus access occurs. Bits 31 - 28 of the local bus virtual address are ignored in
the address comparison.
Note:
The USB host controller can malfunction if the local bus MMU is programmed
with tiny pages. See Section 14.8.2.1, Local Bus MMU Page Size and the
USB Host Controller, for more information.
Table 14–59. Local Bus MMU CAM High Register
Access
Hardware
Reset
Bit Name Function
User Sup
Reset
Value
15–6 Reserved Reserved – – –
5–0 VA_tag_l1_H The most significant six bits of the
local bus virtual address, which are
used for this entry level 1 table index.
Because the local bus MMU ignores
bits 31 - 28 of the local bus virtual
address, these 6 bits correspond to
bits 27 - 22 of the 32-bit local bus
virtual address used by the USB host
controller.
R/W R/W 0