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PMC-Sierra, Inc.
PM73121AAL1gator II
L
PMC-980620
,VVXH
AAL1 SAR Processor
Data Sheet
35235,(7$5<$1'&21),'(17,$/7230&6,(55$,1&$1')25,76&86720(56,17(51$/86(
7.6.10
MATH_TBL
Organization: 8 K words
Base address: 0C000
h
Index: 1
h
Type: Read/Write
Function: The math table must be loaded into SRAM on every power cycling, except in
UDF-HS mode, in which case the math table is not used. The math table stores the
results of five different mathematical operations.
DIV_OP performs the integer divide and roundup-to-next integer operation. The num-
ber of integer credits (six bits) is divided by the number of channels (five bits). These
two fields are concatenated to form an 11-bit address into the table. The result is an
8-bit integer.
MOD_ADD_OP adds the results of the frame location to the frame offset. In the case
of T1 structured data, the mod is 120. All others use a module 128. The result is a 7-bit
integer. A 7-bit frame value is concatenated with a 6-bit frame increment value to form
a 13-bit address.
MULT_OP determines the number of earned integer credits for next service time. It is
obtained by multiplying the number of channels by the frame increment value. A 6-bit
frame value is concatenated with a 5-bit channel count to create an 11-bit address.
T1_MF_DIV_OP determines the number of 1/8 multiframes and the remainder of the
division given a frame count for the T1 mode of operation.
E1_MF_DIV_OP determines the number of 1/8 multiframes and the remainder of the
division given a frame count for the E1 mode of operation.
Format: The four values resulting from the math operations are stored in the same table, as
shown in Figure 85.
NOTE: The AAL1gator II uses a different math table than previous versions of the chip. The
Field (Bits)
Description
This table is available in the Software Driver available at http://www.pmc-sierra.com.