TC1765 Datasheet, PDF (43/88 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1765
Preliminary
External Bus Unit
The External Bus Unit (EBU) of the TC1765 is the interface between external memories
and peripheral units and the internal memories and peripheral units. The basic structure
of the EBU is shown in Figure 11.
T riC o re
CPU
PMU
with on-chip
Progam M emory
Burst Mode
Instruction
Fetches
B IF U
FPI Bus
EBU
10 _Control
Lines
5 _{Chip Select}
Lines
A [2 3 :0 ]
DMU
FBU
with on-chip
Data M em ory
To Peripheral
Units and DM A
D [3 1 :0 ]
E C IN
ECOUT
M C A04983
Figure 11 EBU Structure and Interfaces
The EBU consists of two parts and is used for the following two operations:
• FBU (FPI Bus Unit):
– Communication with external memories or peripheral units via the FPI Bus
– Non-burst instruction fetches
• BIFU (Burst Instruction Fetch Unit):
– Instruction fetches from the PMU to external Burst Flash program memories with
16-bit and 32-bit data width
The EBU controls all transactions required for these two operations and in particular
handles the arbitration between these two tasks.
The types of external devices/Bus modes controlled by the FBU are:
– INTEL style peripherals (separate RD and WR signals)
– MOTOROLA style peripherals (OE and R/W)
– ROMs, EPROMs
– Static RAMs
– Peripherals with demultiplexed A/D bus
– Burst Mode Flash Memories
– 8-, 16- and 32-bit data bus width
Data Sheet
39
V1.2, 2002-12