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MCM72BA32 Datasheet(PDF) 5 Page - Motorola, Inc

Part # MCM72BA32
Description  256KB and 512KB BurstRAM Secondary Cache Module for Pentium
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MCM72BA32 Datasheet(HTML) 5 Page - Motorola, Inc

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MCM72BA32
•MCM72BA64
5
MOTOROLA FAST SRAM
MCM67B618 BLOCK DIAGRAM (See Note)
DQ0 – DQ8
CLR
Q0
Q1
A0
A1
K
ADSC
ADSP
A0 – A15
E
G
ADDRESS
REGISTER
WRITE
REGISTER
ENABLE
REGISTER
DATA–IN
REGISTERS
OUTPUT
BUFFER
64K
× 18
MEMORY
ARRAY
ADV
BURST LOGIC
INTERNAL
ADDRESS
A0
A1
16
9
18
16
2
A2 – A15
A1 – A0
DQ9 – DQ17
9
9
9
9
9
UW
LW
NOTE:
All registers are positive–edge triggered. The ADSC or ADSP signals control the duration of the burst and the start of the
next burst. When ADSP is sampled low, any ongoing burst is interrupted and a read (independent of W and ADSC) is per-
formed using the new external address. Alternatively, an ADSP–initiated two cycle WRITE can be performed by asserting
ADSP and a valid address on the first cycle, then negating both ADSP and ADSC and asserting LW and/or UW with valid
data on the second cycle (see Single Write Cycle in WRITE CYCLES timing diagram).
When ADSC is sampled low (and ADSP is sampled high), any ongoing burst is interrupted and a read or write (dependent
on W) is performed using the new external address. Chip enable (E) is sampled only when a new base address is loaded.
After the first cycle of the burst, ADV controls subsequent burst cycles. When ADV is sampled low, the internal address
is advanced prior to the operation. When ADV is sampled high, the internal address is not advanced, thus inserting a wait
state into the burst sequence accesses. Upon completion of a burst, the address will wrap around to its initial state. See
BURST SEQUENCE TABLE. Write refers to either or both byte write enables (LW, UW).
BURST SEQUENCE TABLE (See Note)
External Address
A15 – A2
A1
A0
1st Burst Address
A15 – A2
A1
A0
2nd Burst Address
A15 – A2
A1
A0
3rd Burst Address
A15 – A2
A1
A0
NOTE: The burst wraps around to its initial state upon completion.


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