Datasheet

Chapter 17. Signal Descriptions 17-3
Overview
Table 17-1. MCF5407 Signal Index
Signal Name Abbreviation Function I/O Reset Pull-Up Page
Section 17.2, “MCF5407 Bus Signals”
17-7
Address A[31:0] 32-bit address bus. A[4:2] indicate
the interrupt level for external
interrupts.
I/O Three
state
17-7
Data D[31:0] Data bus. D[7:0] are loaded at reset
for bus configuration.
I/O Three
state
17-8
Read/Write R/W
Identifies read and write transfers I/O Three
state
Up 17-8
Size SIZ[1:0] Indicates the data transfer size I/O Three
state
17-8
Transfer start TS
Indicates the start of a bus transfer I/O Three
state
17-9
Address strobe AS
Indicates a bus cycle has been
initiated and address is stable
I/O Three
state
Up 17-9
Transfer acknowledge T
A Assertion terminates transfer
synchronously
I/O Three
state
Up 17-9
Transfer in progress TIP
/PP7 Indicates a bus cycle is in progress;
multiplexed with PP7
O Parallel
port
17-10
Transfer type TT[1:0] Indicates transfer type: normal, CPU
space, emulator mode, or DMA;
multiplexed with PP[1:0]
O Parallel
port
17-10
Transfer modifier TM[2:0] Provides transfer modifier
information; multiplexed with
TM2/PP4 and
TM[1:0]/PP[3:2]/DACK[1:0]
O Parallel
port
17-10
Section 17.3, “Interrupt Control Signals”
17-12
Interrupt request IRQ7
, IRQ5,
IRQ3
, IRQ1
Four external interrupts are set to
default levels 1,3,5,7; user-alterable.
I — Up 17-12
Section 17.4, “Bus Arbitration Signals”
17-12
Bus request BR
Indicates processor needs bus O High 17-12
Bus grant BG
Arbiter asserts to grant mastership. I — Note
1
17-12
Bus driven BD
Indicates processor is driving bus O High 17-13
Section 17.5, “Clock and Reset Signals”
17-13
Reset in RSTI
Processor reset input I — Up 17-13
Clock input CLKIN Input used to clock internal logic I — 17-13
Bus clock out BCLKO Bus clock reference output O — 17-13
Reset out RST
O Processor reset output O Low 17-13
Auto-acknowledge
configuration
2
AA_CONFIG Controls auto acknowledge timing
for CS0
at reset
I — 17-14
Port size configuration
2
PS_CONFIG[1:0] Controls port size for CS0 at reset I — User cfg 17-14