xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 124

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

XRT94L33
Rev.1.2.0.
• Servicing of various interrupts.
Each of these operations (between the microprocessor and the XRT94L33) will be discussed in some detail,
throughout this data sheet.
Figure 3 Simple Block Diagram of Microprocessor Interface block of XRT94L33
1.3.1
The XRT94L33 may be configured into a wide variety of different operating modes and have its performance
monitored by software through a microprocessor, using data, address and control signals.
The µC/µP configures the XRT94L33 (into a desired operating mode) by writing data into specific
addressable, on-chip “Read/Write” registers; or on-chip RAM. The microprocessor interface provides the
signals which are required for a general purpose microprocessor to read or write data into these registers.
The Microprocessor Interface also supports “polled” and interrupt driven environments. These interface
signals are described below in Tables 1, 2, and 3. The microprocessor interface within the XRT94L33 can be
configured to operate in two basic modes.
• The Intel Asynchronous Mode, and
• The Power PC 403 Mode
Each of these Microprocessor Interface Modes is described in detail below.
1.3.1.1
Whenever the Microprocessor Interface has been configured to operate in the “Intel Asynchronous” mode,
then some of the these control signals function in a manner as required by the “Intel 80xx” family of
Microprocessors.
presents a brief description of each of the Microprocessor Interface pins whenever the Microprocessor
Interface has been configured to operate in the “Intel Asynchronous” Mode.
T
HE
T
HE
M
I
ICROPROCESSOR
NTEL
A
SYNCHRONOUS
Ptype [2:0]
Ptype [2:0]
Rdy _ Dtck
Rdy _ Dtck
WrB _RW
WrB _RW
RdB _DS
RdB _DS
ALE_AS
ALE_AS
A[14:0]
A[14:0]
D[7:0]
D[7:0]
RESET*
RESET*
CSB*
CSB*
INT*
INT*
I
NTERFACE
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
M
ODE
S
:
IGNALS
124
Microprocessor
Microprocessor
Interface
Interface
Block
Block
xr