MC68306FC16 Datasheet, PDF (23/191 Pages) Motorola, Inc – Integrated EC000 Processor

Table 2-1. Bus Signal Summary
Signal Name
Mnemonic
Input/ Three-State During
Output
Bus Arbitration
Address Signals
A23–A1
Output
Yes
Address Strobe
AS
Output
Yes
Bus Error
BERR
I/O
—
Bus Grant
BG
Output
No
Bus Grant Acknowledge
BGACK
Input
—
Bus Request
BR
Input
—
Data Bus
D15–D0
I/O
Yes
Data Transfer Acknowledge
DTACK
I/O
—
DRAM Multiplexed Address14–0 DRAMA14–DRAMA0 Output
Yes
Function Codes
FC2–FC0
Output
Yes
Halt
HALT
I/O
—
Lower Data Strobe
LDS
I/O
Yes
Upper Data Strobe
UDS
I/O
Yes
Lower-Byte Write Strobe
LW
Output
No
Upper-Byte Write Strobe
UW
Output
No
Output Enable
OE
Output
No
Read/Write
R/ W
Output
Yes
Reset
RESET
I/O
—
NOTES:
1. Pullup may be required, value depends on individual application. Must not be left floating.
Pullup Required
4.7 K
2.2 K
(1)
(1)
2.2 K
2.2 K
4.7 K
4.7 K
2.2 K
Table 2-2. Chip Select Signal Summary
Signal Name
Chip Select
Chip Select 4–7/Address Port 23 –
20
Mnemonic
CS3–CS0
CS7–CS4/ A23–A20
Input/
Output
Output
Output
Three-State During
Bus Arbitration
Yes
Yes
Pullup Required
4.7 K
4.7 K
Table 2-3. DRAM Controller Signal Summary
Signal Name
Column Address Strobe
Row Address Strobe
DRAM Write Signal
Mnemonic
CAS1–CAS0
RAS1–RAS0
DRAMW
Input/
Output
Output
Output
Output
Three-State During
Bus Arbitration
Yes
Yes
Yes
Pullup Required
4.7 K
4.7 K
MOTOROLA
MC68306 USER'S MANUAL
2-3