參數(shù)資料
型號(hào): PM7351-BI
廠商: PMC-SIERRA INC
元件分類: 數(shù)字傳輸電路
英文描述: OCTAL SERIAL LINK MULTIPLEXER
中文描述: ATM/SONET/SDH SUPPORT CIRCUIT, PBGA304
封裝: 31 X 31 MM, 1.51 MM HEIGHT, 1.27 MM PITCH, SBGA-304
文件頁數(shù): 31/174頁
文件大?。?/td> 1790K
代理商: PM7351-BI
RELEASED
PM7351 S/UNI-VORTEX
DATA SHEET
PMC-1980582
ISSUE 5
OCTAL SERIAL LINK MULTIPLEXER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
21
Ball
Name
Type
Ball
No.
Function
TENB
Input
U22
The active low write enable (TENB) signal is used to
indicate cell transfers to the internal cell buffers. The
segment of the buffer associated with a particular
logical channel is determined by the inband address in
the prepended cell bytes.
TENB is ignored if TSX is high. Upon the completion
of a cell transfer, TENB may be held low because a
cell transfer is only initiated by assertion of TSX.
TENB must be low for 26 to 28 (depending on the
inclusion of optional words) cycles to transfer an entire
cell. TENB may be deasserted high at any time to
pause a cell transfer.
TENB is updated on the rising edge of TCLK.
TADR[11]
TADR[10]
TADR[9]
TADR[8]
TADR[7]
TADR[6]
TADR[5]
TADR[4]
TADR[3]
TADR[2]
TADR[1]
TADR[0]
Input
T20
U21
V22
W23
U20
V21
W22
Y23
W21
Y22
AA23
Y21
The TADR[11:0] signals are used to address logical
channels for the purposes of polling.
Upon sampling a TADR[11:3] value within one of the
address ranges set by the Control Channel Base
Address, Logical Channel Base Address and Logical
Channel Address Range / Logical Channel Base
Address MSB registers, TPA will be driven to indicate
the availability of the buffer segment addressed by
TADR[4:0]. When TADR[11:3] does not match a
programmed address range, TPA becomes high
impedance.
The TADR[11:0] bus is sampled on the rising edge of
TCLK.
TSX
Input
T21
The transmit start of cell (TSX) indication signal marks
the start of cell on the TDAT[15:0] data bus. When
TSX is high, the first word of the cell structure is
present on the TDAT[15:0] stream. TSX must be
asserted for each cell. An interrupt may be generated
if TSX is high during any word other than the expected
first word of the cell structure.
TSX is sampled on the rising edge of TCLK.
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