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