PM5381-BI PMC-Sierra, Inc., PM5381-BI Datasheet - Page 531
PM5381-BI
Manufacturer Part Number
PM5381-BI
Description
ATM UNI, Single Channel ATM PHY Interface for 2488.32Mbps
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5381-BI.pdf
(586 pages)
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Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000489, Issue 4
Examples:
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·
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s = 2 (7 clock latency for response to DTPA)
m = 1 (min 4-byte packet)
ovrhd_cycles = 0 (4 byte packet, no null cycles guaranteed between each
packet/burst)
num_min_pack = downround ((5+2-1)/(1+0)) = 6
min_pack_size_in_blocks = upround(1/4) = 1
remainder = upround (((5+2-1)mod1)/4) = 0
BT[4:0] ³ 1 + (6*1) + 0 – 1 = 6
s = 2 (7 clock latency for response to DTPA)
m = 1 (min 4-byte packet)
ovrhd_cycles = 1 (4 byte packet, 1 null cycle guaranteed between each packet/burst)
num_min_pack = downround ((5+2-1)/(1+1)) = 3
min_pack_size_in_blocks = upround(1/4) = 1
remainder = upround (((5+2-1)mod1)/4) = 0
BT[4:0] ³ 1 + (3*1) + 0 – 1 = 3
s= 2 (7 clock latency for response to DTPA)
m = 13 (atm cell)
ovrhd_cycles = 0 (no null cycles)
num_min_pack = downround ((5+2-1)/(13+0)) = 0
min_pack_size_in_blocks = upround(13/4) = 4
remainder = upround (((5+2-1)mod13)/4) = 2
BT[4:0] ³ 1 + (0*4) + 2 – 1 = 2
For the optional PL3 mode where each burst is not terminated by a TENB transition to logic
1, TPAHOLD must be set to logic 0.
S/UNI-2488 Telecom Standard Product Datasheet
Released
531
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