參數(shù)資料
型號(hào)： XRT86VL38_1
廠商： Exar Corporation
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁(yè)數(shù)： 44/66頁(yè)
文件大?。?/td> 425K
代理商： XRT86VL38_1
XRT86VL38
41
OCTAL T1/E1/J1 FRAMER/LIU COMBO - HARDWARE DESCRIPTION
REV. V1.2.0
REQ1
AA24
Y22
O
8
DMA Cycle Request Output—DMA Controller 1 (Read):
These output pins are used to indicate that DMA transfers
(Read) are requested by the T1/E1 Framer.
On the receive side (i.e., To transmit data from HDLC buff-
ers within the XRT86VL38 to external DMA Controller),
DMA transfers are only requested when the receive buffer
contains a complete message or cell.
The DMA Read cycle starts by T1/E1 Framer asserting the
DMA Request (REQ1) ‘low’, then the external DMA control-
ler should drive the DMA Acknowledge (ACK1) ‘low’ to indi-
cate that it is ready to receive the data. The T1/E1 Framer
should place new data on the Microprocessor data bus
each time the Read Signal is Strobed low if the RD is con-
figured as a Read Strobe. If RD is configured as a direction
signal, then the T1/E1 Framer would place new data on the
Microprocessor data bus each time the Write Signal (WR)
is Strobed low.
The Framer asserts this output pin (toggles it "Low") when
one of the Receive HDLC buffer contains a complete
HDLC message that needs to be read by the μC/μP.
The Framer negates this output pin (toggles it “High”) when
the Receive HDLC buffers are depleted.
INT
R26
N22
O
8
Interrupt Request Output:
This active-low output signal will be asserted when the
XRT86VL38 device is requesting interrupt service from the
Microprocessor. This output pin should typically be con-
nected to the “Interrupt Request” input of the Microproces-
sor.
The Framer will assert this active "Low" output (toggles it
"Low"), to the local μP, anytime it requires interrupt service.
MICROPROCESSOR INTERFACE
S
IGNAL
N
AME
420 P
KG
B
ALL
#
484P
KG
B
ALL
#
T
YPE
O
UTPUT
D
RIVE
(
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A)
D
ESCRIPTION
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XRT86VL38ES 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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