
XRT94L31
61
REV. 1.0.1
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
AC15
STS1TXA_2_D2
TXHDLCDAT_2_2
TXCELLTXED_2
I/O
TTL/
CMOS
Transmit STS-1 Telecom Bus Interface - Channel 2 - Data Bus Input
pin number 2/Transmit High-Speed HDLC Controller Input Interface
block - Channel 2 - Input Data Bus - Pin 2:
The function of this pin depends upon whether or not the STS-1 Telecom
Bus Interface, associated with Channel 2 is enabled.
If STS-1 Telecom Bus (Channel 2) has been enabled - Transmit STS-
1 Telecom Bus Interface - Input Data Bus pin number 2 -
STS1TXA_2_D2:
This input pin along with STS1TXA_2_D[7:3] and STS1TXA_2_D[1:0]
function as the Transmit (Add) STS-1 Telecom Bus Interface - Input Data
Bus for Channel 2. The Transmit STS-1 Telecom Bus interface will sam-
ple and latch this pin upon the falling edge of STS1TXA_CLK_2.
If the STS-1 Telecom Bus Interface (associated with Channel 2) has
been disabled.
This input/output pin can function in either of the following roles, depend-
ing upon which mode the XRT94L31 has been configured to operate in.
If the XRT94L31 has been configured to operate in the High-Speed
HDLC Controller over DS3/STS-3 Mode - Transmit High-Speed HDLC
Controller Input Interface block - Transmit High-Speed HDLC Controller
Input Interface block - Channel 2- Data Bus Input pin # 2
TXHDLCDAT_2_2:
In this mode, this input pin will function as Bit 1 within the Transmit High-
Speed HDLC Controller Input Interface block - Input Data Bus (e.g., the
TxHDLCDat_2[7:0] input pins).
The Transmit High-Speed HDLC Controller Input Interface block will pro-
vide the System-Side Terminal equipment with a byte-wide Transmit
High-Speed HDLC Controlller clock output signal (TxHDLCClk_2). The
Transmit High-Speed HDLC Controller Input Interface block will sample
the data residing on this input pin (along with the rest of the
TxHDLCDat_2[7:0] input pins) upon the rising edge of the TxHDLCClk_2
clock output signal.
If the XRT94L31 has been configured to operate in the ATM UNI
Mode
- TXCELLTXED_2 (Cell Transmitted - Channel 2)
PIN DESCRIPTION OF THE XRT94L31 (REV. B)
PIN #
SIGNAL NAME
I/O
TYPE
DESCRIPTION