PM5381-BI PMC-Sierra, Inc., PM5381-BI Datasheet - Page 426

• Manufacturer Part Number: PM5381-BI
• Description: ATM UNI, Single Channel ATM PHY Interface for 2488.32Mbps
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000489, Issue 4
TPAHOLD
TPAHOLD can be used for systems where the PL3 is burst-based. Because it's burst based,
between every burst, TENB must be logic 1. This is just a cycle that separates bursts.
With TPAHOLD = 1, the DTPA signal will respond (-> 0) with the minimum 1 cycle delay.
With TPAHOLD =0, the response is 5 cycles.
TPAHOLD = 1 will allow the user to more fully utilize the entire FIFO when the buffer
threshold is set to 2*burst size.
See Section 13.12 for more information. This bit cannot be changed during operation and can
only be changed when TXPRST is logic 1.
S/UNI-2488 Telecom Standard Product Datasheet
Released
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