Integra DTR-5.9 Service Manual page 43

IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-6
Q281 : M12L64164A-7TG ( 1M x 16 Bit x 4 Banks Synchronous DRAM )
BLOCK DIAGRAM
CLK
Clock
Generator
CKE
Address
Mode
Register
CS
RAS
CAS
WE
TERMINAL DESCRIPTION
Pin Name Description
CLK Active on the positive going edge to sample all inputs.
CS Disables or enables device operation by masking or enabling all inputs except CLK , CKE and L(U)DQM.
CKE Masks system clock to freeze operation from the next clock cycle.
CKE should be enabled at least one cycle prior new command.
Disable input buffers for power down in standby.
A0 ~ A11 Row / column address are multiplexed on the same pins.
Row address : RA0~RA11, column address : CA0~CA7.
A12 , A13 Selects bank to be activated during row address latch time.
Selects bank for read / write during column address latch time.
RAS Latches row addresses on the positive going edge of the CLK with RAS low.
Enables row access & precharge.
CAS Latches column address on the positive going edge of the CLK with CAS low. Enables column access.
WE Enables write operation and row precharge. Latches data in starting from CAS , WE active.
L(U)DQM Makes data output Hi-Z, t
Blocks data input when L(U)DQM active.
DQ0 ~ DQ15 Data inputs / outputs are multiplexed on the same pins.
VDD / VSS Power and ground for the input buffers and the core logic.
VDDQ / VSSQ Isolated power supply and ground for the output buffers to provide improved noise immunity.
NC This pin is recommended to be left No Connection on the device.
Bank D
Bank C
Bank B
Row
Address
Buffer
Bank A
&
Refresh
Counter
Sense Amplifier
Column
Column Decoder
Address
Buffer
&
Refresh
Counter
Data Control Circuit
after the clock and masks the output.
SHZ
PIN LAYOUT
VDD 1
DQ0 2
VDDQ 3
DQ1 4
DQ2 5
VSSQ 6
DQ3 7
DQ4 8
VDDQ 9
DQ5 10
DQ6 11
VSSQ 12
DQ7 13
L(U)DQM
VDD 14
LDQM 15
WE 16
CAS 17
RAS 18
CS 19
A13 20
A12 21
DQ
A10/AP 22
A0 23
A1 24
A2 25
A3 26
VDD 27
DTR-5.9
TOP VIEW
54 VSS
53 DQ15
52 VSSQ
51 DQ14
50 DQ13
49 VDDQ
48 DQ12
47 DQ11
46 VSSQ
45 DQ10
44 DQ9
43 VDDQ
42 DQ8
41 VSS
40 NC
39 UDQM
38 CLK
37 CKE
36 NC
35 A11
34 A9
33 A8
32 A7
31 A6
30 A5
29 A4
28 VSS