XRT72L58 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT72L58' PDF : 486 Pages View PDF
XRT72L58
EIGHT CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
áç
PRELIMINARY
PIN DESCRIPTION FOR THE XRT72L58
PIN #
J25
PIN NAME
RDY_DTCK
J26
D(6)
K1
TxPOS[5]
K2
TxLineClk[5]
K3
RxOutClk[0]/
RxHDLCDat7[0]
K4
TxNEG[0]
K23
D(7)
K24
D(5)
K25
D(4)
K26
NC
L1
TxInClk[5]
L2
TxNEG[5]
L3
RxOutClk[5]/
RxHDLCDat7[5]
L4
ExtLOS[5]
L11
VDD
L12
VDD
L13
VDD
L14
VDD
L15
VDD
L16
VDD
TYPE
O
I/O
O
O
O
DESCRIPTION
READY or DTACK:
This active-low output pin will function as the READY output, when the micro-
processor interface is running 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 negates this output pin (e.g., toggles it "low"), it indicates (to
the µP) that the current READ or WRITE cycle is to be extended until this sig-
nal is asserted (e.g., toggled "high").
"Motorola" Mode - DTACK (Data Transfer Acknowledge) Output:
The Framer will assert this pin in order to inform the local microprocessor that
the present READ or WRITE cycle is nearly complete. If the Framer requires
that the current READ or WRITE cycle be extended, then the Framer will
delay its assertion of this signal. The 68000 family of µPs requires this signal
from its peripheral devices, in order to quickly and properly complete a READ
or WRITE cycle.
See Description of Pin K23
See Description of Pin E1
See Description of Pin D1
See Description of Pin F2
O
See Description of Pin F1
I/O MSB of Bi-Directional Data Bus (Microprocessor Interface Section):
This pin, along with pins D0 - D6, function as the Microprocessor Interface bi-
directional data bus, and is intended to be interfaced to the "local" micropro-
cessor.
I/O See Description of Pin K23
I/O See Description of Pin K23
I
See Description of Pin G2
O
See Description of Pin F1
O
See Description of Pin F2
I
See Description of Pin E2
**** Power Supply 3.3V + 5%
**** Power Supply 3.3V + 5%
**** Power Supply 3.3V + 5%
**** Power Supply 3.3V + 5%
**** Power Supply 3.3V + 5%
**** Power Supply 3.3V + 5%
17
Share Link: 
