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參數(shù)資料
| 型號： | XRT79L74IB |
| 廠商： | EXAR CORP |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | 4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| 中文描述： | ATM NETWORK INTERFACE, PBGA456 |
| 封裝： | 27 X 27 MM, 1 MM PITCH, PLASTIC, BGA-456 |
| 文件頁數(shù)： | 7/70頁 |
| 文件大小： | 547K |
| 代理商： | XRT79L74IB |
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PRELIMINARY
XRT79L74
REV. P1.0.0
4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
5
U26
RDY/DTACK
O
READY or DTACK:
This active-low output pin will function as the READY output when the Microproces-
sor Interface is configured to operate in the Intel Mode; and will function as the
DTACK output when the Microprocessor Interface is running in the Motorola Mode.
Intel Mode - READY output:
When the Framer/UNI negates this output pin (e.g., toggles it "Low") it indicates to
the Microprocessor that the current READ or WRITE operation is to be extended until
this signal is asserted (e.g., toggled "High").
Motorola Mode - DTACK Data Transfer Acknowledge Output:
The Framer/UNI will assert this pin in order to inform the Microprocessor that the
present READ or WRITE cycle is nearly complete. If the Framer/UNI requires that
the current READ or WRITE cycle be extended, then the Framer/UNI will delay its
assertion of this signal. The 68000 family of Microprocessors requires this signal
from its peripheral devices, in order to quickly and properly complete a READ or
WRITE cycle.
AF4
RESET
I
Reset Input:
When this active-low signal is asserted, the Framer/UNI device will be asynchro-
nously reset. When this occurs, all outputs will be tri-stated and all on-chip registers
will be reset to their default values.
AA26
μPCLK
I
Microprocessor Interface Clock Input:
This clock input signal is used for synchronous/burst/DMA data transfer operations.
This clock can be running up to 33MHz.
AC23
WR/R/W
I
Write Strobe Intel Mode:
If the Microprocessor Interface is configured to operate in the Intel Mode, then this
active-low input pin functions as the WR (WRITE Strobe) input signal from the Micro-
processor. Once this active-low signal is asserted, the Framer/UNI will latch the con-
tents of the bi-directional data D[7:0] into the addressed registers or Buffer location
within the Framer/UNI IC.
R/W Input Pin Motorola Mode:
When the Microprocessor Interface Section is operating in the Motorola Mode, then
this pin is functionally equivalent to the R/W pin. In the Motorola Mode, a READ
operation occurs if this pin is at a logic "1". Similarly a WRITE operation occurs if this
pin is at a logic "0".
AB22
AC22
AD22
PTYPE_0
PTYPE_1
PTYPE_2
I
Microprocessor Type Select input:
These three input pins are used to configure the Microprocessor Interface block to
readily support a wide variety of Microprocessor Interfaces. The relationship
between the settings of these input pins and the corresponding Microprocessor Inter-
face configuration is presented below.
"000" = Intel Asynchronous Mode
"001" = Motorola Asynchronous Mode
"111" = Power PC Mode
AF22
DBEN
I
Bi-directional Data Bus Enable Input pin:
If the Microprocessor Interface is operating in the Intel-I960 Mode, then this input pin
is used to enable the Bi-directional Data Bus.
Setting this input pin "Low" enables the Bi-directional Data bus. Setting this input
"High" tri-states the Bi-directional Data Bus.
PIN DESCRIPTIONS
P
IN
#
N
AME
TYPE
D
ESCRIPTION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XRT8000ID | Clock Synchronizer/Adapter for Communications |
| XRT8000 | Clock Synchronizer/Adapter for Communications(用于通訊的時(shí)鐘同步設(shè)備/調(diào)整器) |
| XRT8001 | WAN Clock for T1 and E1 Systems |
| XRT8001ID | WAN Clock for T1 and E1 Systems |
| XRT8001IP | WAN Clock for T1 and E1 Systems |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT8000 | 制造商:EXAR 制造商全稱:EXAR 功能描述:Clock Synchronizer/Adapter for Communications |
| XRT8000_06 | 制造商:EXAR 制造商全稱:EXAR 功能描述:Clock Synchronizer/Adapter for Communications |
| XRT8000D | 制造商:EXAR 制造商全稱:EXAR 功能描述:CLOCK SYNCHRONIZER/ADAPTER FOR COMMUNICATIONS |
| XRT8000ES | 功能描述:鎖相環(huán) - PLL WAN CLOCK RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| XRT8000ID | 制造商:EXAR 制造商全稱:EXAR 功能描述:Clock Synchronizer/Adapter for Communications |
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