XRT83L314 Datasheet, PDF (46/84 Pages) Exar Corporation – 14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT

XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
5.0 MICROPROCESSOR INTERFACE BLOCK
The Microprocessor Interface section supports communication between the local microprocessor (µP) and the
LIU. The XRT83L314 supports an Intel asynchronous interface, Motorola 68K asynchronous, and a Motorola
Power PC interface. The microprocessor interface is selected by the state of the µPTS[2:0] input pins. Select-
ing the microprocessor interface is shown in Table 14.
TABLE 14: SELECTING THE MICROPROCESSOR INTERFACE MODE
µPTS[2:0]
MICROPROCESSOR MODE
0h (000)
Intel 68HC11, 8051, 80C188
(Asynchronous)
1h (001)
Motorola 68K (Asynchronous)
7h (111)
Motorola MPC8260, MPC860
Power PC (Synchronous)
The XRT83L314 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 dia-
gram of the microprocessor is shown in Figure 41.
FIGURE 41. SIMPLIFIED BLOCK DIAGRAM OF THE MICROPROCESSOR INTERFACE BLOCK
CS
WR_R/W
RD_WE
ALE
ADDR[10:0]
DATA[7:0]
µPclk
Microprocessor
Interface
µPType [2:0]
Reset
RDY_TA
INT
CS5
CS4
CS3
CS2
CS1
42