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參數(shù)資料
| 型號： | PM5352-B1 |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁數(shù)： | 27/77頁 |
| 文件大?。?/td> | 901K |
| 代理商： | PM5352-B1 |
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PM5352 S/UNI STAR
DATA SHEET
PMC-1990421
ISSUE 2
SATURN USER NETWORK INTERFACE 155 (STAR)
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
23
Pin Name
Type
Pin
No.
Function
DTPA
Output
(POS)
K22
POS-PHY Direct Transmit Packet Available (DTPA).
These output signals provide direct status indication
of when some programmable number of bytes is
available in the transmit FIFO, for the
corresponding port. When transitioning high, DTPA
indicates that the transmit FIFO has enough room
to store data. The transition level is selected by the
TXFP Transmit Packet Available Low Water-mark
(TPALWM[7:0]) register. When DTPA transitions
low, it indicates that the transmit FIFO is either full
or near full as selected by the TXFP Transmit
Packet Available High Water-mark (TPAHWM[7:0])
register. This last option provides the Link Layer
system with some look ahead capability in order to
avoid FIFO overruns and smoothly transition
between PHY’s.
DTPA are updated on the rising edge of TFCLK.
TMOD
Input
(POS)
F22
POS-PHY Transmit Word Modulo (TMOD) signal.
TMOD indicates the size of the current word. TMOD
is only used during the last word transfer of a
packet, at the same time TEOP is asserted. During
a packet transfer every word must be complete
except the last word, which can be composed of 1
or 2 bytes. TMOD set high indicates a 1-byte word
(present on MSB’s, LSB’s are discarded) while
TMOD set low indicates a 2-byte word.
TMOD is considered valid only when TENB is
simultaneously asserted and the S/UNI-STAR is
selected via TADR[2:0].
TMOD is sampled on the rising edge of TFCLK.
This Material Copyrighted by Its Respective Manufacturer
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