VSC6134
Datasheet
3.6.37
Add/Drop TCM1 TTI Generator FIFO Access Register
This register provides access to a 32-word deep, 16-bit wide FIFO that holds the TTI values to be
inserted into the TCM1 field if provisioned. The FIFO has one configurable pointer for both read and
write operations shown in Table 184. Each time a read or write operation occurs at this address (0x857
Add or 0x2D7 Drop), the pointer is automatically incremented by 1. The value of n is in the range from
0 to 63 and each of the 32 registers in the FIFO contains two 8-bit values for TTI. The values that reside
in the FIFO’s 64 eight-bit fields are the value that are inserted into the outgoing TTI field on a rotating
basis. The 64-byte TTI signal is aligned with the OTU MFAS. Byte 0 of the 64-byte TTI signal is
present at OTU multiframe positions 00, 40, 80, and C0 (hex).
Address:
0x857: Add Path
0x2D7: Drop Path
0x0000
Register Reset Value:
Table 190. Add/Drop TCM1 TTI Generator FIFO Access Register
Reset
Value
Bit
Name
Access
Description
15:8
[ADD/DROP]_TCM1_TTI n
(n is odd)
R/W
The value at bits [15:8] of address 11111 of the FIFO
represents TTI 63.
0x00
7:0
[ADD/DROP]_TCM1_TTI n
(n is even)
R/W
The value of bits [7:0] of address 00000 of the FIFO
represents TTI 0.
0x00
274 of 438
VMDS-10185 Revision 4.0
July 2006
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
