XRT83VSH28IB-F View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83VSH28IB-F' PDF : 74 Pages View PDF
PRELIMINARY
XRT83VSH28
REV. P1.0.0
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
5.2 Parallel Microprocessor Interface Block
The Parallel Microprocessor Interface section supports communication between the local microprocessor (µP)
and the LIU. The XRT83VSH28 supports an Intel asynchronous interface, Motorola 68K asynchronous, and an
Intel/Motorola interface. The microprocessor interface is selected by the state of the µPTS[1:0] input pins.
Selecting the microprocessor interface is shown in Table 10.
TABLE 10: SELECTING THE MICROPROCESSOR INTERFACE MODE
µPTS[1:0]
MICROPROCESSOR MODE
0h (00)
Intel 68HC11, 8051, 80C188
(Asynchronous)
1h (01)
Motorola 68K (Asynchronous)
3h (11)
MPC8xx Power PC (Synchronous)
The XRT83VSH28 uses multipurpose pins to configure the device appropriately. The local µP configures the
LIU by writing data into specific addressable, on-chip Read/Write registers. 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. A simplified
block diagram of the microprocessor is shown in Figure 32.
FIGURE 32. SIMPLIFIED BLOCK DIAGRAM OF THE MICROPROCESSOR INTERFACE BLOCK
CS
WR_R/W
RD_DS
ALE
ADDR[7:0]
DATA[7:0]
µPclk
µPType [1:0]
Reset
RDY
INT
Microprocessor
Interface
42
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