MC68EC000 Motorola, MC68EC000 Datasheet - Page 39

• Manufacturer Part Number: MC68EC000
• Description: Core Processor (SCM 68000)
• Manufacturer: Motorola

Signal Description
All pins must be multiplexed according to the requirements in Table 2-8. However, it is nec-
essary that the proper three-state control signal be used to control the three-state drivers as
stated in 2.8 Three-State Control . Table 2-8 shows a list of pins and the priority with which
they need to be multiplexed. The priority column has three possible responses: required,
required if used, not required, and internal. The “required if used” response means that the
pin must be muxed out if the pin is used in the current design. The "internal" response means
that the signal may be used internally and must not be muxed out.
2-10
* HALTIB and HALTOB may share a single pin, HALTB, that is functionally equivalent to
the circuit in Figure 4-10.
RESETIB and RESETOB may share a single pin, RESETB, that is functionally
equivalent to the circuit in Figure 4-10.
Microsequencer Status Indication
Address Three-State Control
Data Transfer Acknowledge
Bus Grant Acknowledge
Address Output Enable
Control Output Enable
Data Output Enable
Lower Data Strobe
Read-Modify-Write
Data Transfer Size
Upper Data Strobe
Interrupt Pending
Early Read Write
Interrupt Control
Address Strobe
Disable Control
CPU Pipe Refill
Function Code
Signal Name
Bus Request
Address Bus
Address Bus
Data Strobe
Read/Write
Reset Out*
Autovector
Test Clock
Bus Grant
Clock Out
Bus Error
Data Bus
Halt Out*
Reset In*
Clock In
Halt In*
Mode
Stop
Test
Freescale Semiconductor, Inc.
EC000 CORE PROCESSOR USER’S MANUAL
Table 2-8. Pin Multiplexing Priority
For More Information On This Product,
Go to: www.freescale.com
IPLB2–IPLB0
RESETOB
SIZ1, SIZ0
STATUSB
Pin Name
TESTCLK
FC2–FC0
RESETIB
A31–A24
BGACKB
DTACKB
REFILLB
HALTOB
D15–D0
IPENDB
A23–A0
BERRB
HALTIB
AVECB
TSCAE
ERWB
MODE
COEB
DOEB
RMCB
AOEB
CLKO
STOP
UDSB
LDSB
TEST
DISB
RWB
CLKI
ASB
BGB
BRB
DSB
Input/Output
Input/Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Required If Used
Required If Used
Required If Used
Required If Used
Required If Used
Required If Used
Required If Used
Required If Used
Required If Used
Required If Used
Required If Used
Not Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Priority
Internal
Internal
Internal
Internal
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