PXB4219 Datasheet, PDF (115/290 Pages) Infineon Technologies AG – IWE8 Interworking Element for 8 E1/T1 Lines

PXB4219 / PXB4220 / PXB4221
Interface Description
5.5.2 Microprocessor Interface Mode
The IWE8 microprocessor interface allows connection of Intel type microprocessors as
well as Motorola type microprocessors (e.g. the PowerPC).
The Microprocessor Interface Mode is determined via the status of the pins PMT and
TBUS at the positive edge of the internal reset. Therefore, PMT and TBUS levels have
to be kept at least 3 clock cycles after deassertion of RESET.
Table 28 Configuration of the Microprocessor Interface Mode via PMT and TBUS
PMT
TBUS
Mode
0
0
Intel Mode
1
1
Motorola Mode
The mode currently assigned to the microprocessor interface is visible via “mtypsel” in
the “Version Register” (“vers”, see Chapter 7.16).
Intel Mode
The connection of the 16 bit Intel compatible asynchronous microprocessor interface to
an Intel 386EX processor is shown in Figure 32.
If the ready signal at pin MPRDY shall be used, a glue logic between MPRDY of the
IWE8 and RDY of the 386EX is required, which generates an active low signal with 1
microprocessor cycle length after a rising edge detection of the MPRDY signal.
Intel i386 EX
INTi
INTj
IWE8
MPIR2
MPIR1
Figure 32
CSn
RD
WR
DATA[0-15]
ADR[1-18]
MPCS
MPRD
MPWR
MPDAT[0-15]
MPADR[0-17]
Connection of IWE8 to an Intel Type Microprocessor
Motorola Mode
Figure 33 shows the connection of the 16 bit Motorola compatible asynchronous
interface to the IBM “PowerPC^TM”.
Data Sheet
115
2002-05-06