ETC1 MAS2911FS Radiation hard microprogram sequencer Datasheet

MA2909/11
APRIL 1995
PRELIMINARY INFORMATION
DS3577-3.4
MA2909/11
RADIATION HARD MICROPROGRAM SEQUENCER
The MA2909/11 Microprogram Sequencer is fully
compatible with the industry standard 2909A and 2911A
components, and forms part of the GPS 2900 Series of
devices. The series offers a building block approach to
microcomputer and controller design, with each device in the
range being expandable to permit efficient emulation of any
microcode machine.
The devices have tristate outputs and have an internal
address register, with all internal registers changing state on
LOW to HIGH clock transition.
The 4-bit slice can cascade to any number of microwords.
Branch input for N-way branches is supported. Additional
features include:
FEATURES
■ Fully Compatible with Industry Standard 2909A and
2911A Components
■ Radiation Hard CMOS SOS Technology
■ High SEU Immunity
■ High Speed / Low Power
■ Fully TTL Compatible
■ 4-bit cascadable microprogram counter.
■ 4 x 4 file with stack counter supporting nesting
microsubroutines.
■ Zero input for returning to the zero microcode word.
■ Individual OR input for each bit for branching to higher
microinstructions (2909 only).
The 2909 is a 4-bit wide address controller intended for
sequencing through a series of microinstructions contained in
a ROM or PROM. Two 2909s may be interconnected to
generate an 8-bit address (256 words), and three may be used
to generate a 12-bit address (4K words).
The 2909 can select an address from any of four sources:
1) A set of external direct inputs (D);
2) External data from the R inputs, stored in an internal
register;
3) A four-word push/pop stack; or
4) A program counter register (which usually contains the
last address plus one).
The push/pop stack includes certain control lines so that it
can efficiently execute nested subroutine linkages. Each of the
four outputs can be OR’ed with an external input for conditional
skip or branch instructions, and a separate line forces the
outputs to all zeroes. The outputs are three-state.
The 2911 is an identical circuit to the 2909 except the four
OR inputs are removed and the D and R inputs are tied
together.
1
MA2909/11
STK PTR
Figure 1: Microprogram Sequencer Block Diagram
2
MA2909/11
The 2909/2911 are CMOS SOS microprogram sequencers
intended for use in high-speed microprocessor applications.
The device is a cascadable 4-bit slice such that two devices
allow addressing of up to 256 words of microprogram and
three devices allow addressing of up to 4K words of
microprogram. A detailed logic diagram is shown in figure 1.
The device contains a four input multiplexer that is used to
select either the address register, direct inputs, microprogram
counter, or file as the source of the next microinstruction
address. This multiplexer is controlled by the S0 and S1 inputs.
The address register consists of four D-type, edge
triggered flip-flops with a common clock enable. When the
address register enable is LOW, new data is entered into the
register on the clock LOW-to-HlGH transition. The address
register is available at the multiplexer as a source for the next
microinstruction address The direct input is a 4-bit field of
inputs to the multiplexer and can be selected as the next
microinstruction address. On the 2911 the direct inputs are
also used as inputs to the register. This allows an N-way
branch where N is any word in the microcode.
The 2909/2911 contains a microprogram counter (µPC)
that is composed of a 4-bit incrementer followed by a 4bit
register. The incrementer has carry-in (Cn) and carry-out (Cn +
4) such that cascading to larger word lengths is straight
forward. The µPC can be used in either of two ways. When the
least significant carry-in to the incrementer is HIGH, the
microprogram register is loaded on the next clock cycle with
the current Y output word plus one (Y + 1 ➜ µPC). Thus
sequential microinstructions can be executed. If this least
significant Cn is LOW, the incrementer passes the Y output
word unmodified and the microprgram register is loaded with
the same Y word on the next clock cycle (Y ➜ µPC). Thus, the
same microinstruction can be executed any number of times
by using the 4x4 file (stack). The file is used to provide return
address linkage when executing microsubroutines. The file
contains a built-in stack pointer (SP) which always points to the
last file word written. This allows stack reference operations
(looping) to be performed without a push or pop.
The stack pointer operates as an up/down counter with
separate push/pop and file enable inputs. When the file enable
input is LOW and the push/pop input is HIGH, the PUSH
operation is enabled. This causes the stack pointer to
increment and the file to be written with the required return
linkage - the next microinstruction address following the
subroutine jump which initiated the PUSH.
If the file enable input is LOW and the push/pop control is
LOW, a POP operation occurs. This implies the usage of the
return linkage during this cycle and thus a return from
subroutine. The next LOW-to-HlGH clock transition causes the
stack pointer to decrement. If the file enable is HIGH, no action
is taken by the stack pointer regardless of any other input.
The stack pointer linkage is such that any combination of
push, pop or stack references can be achieved. One
microinstruction subroutine can be performed. Since the stack
is 4 words deep, up to four microsubroutines can be nested.
The ZERO input is used to force the four outputs to the
binary zero state. When the ZERO input is LOW all Y outputs
are LOW regardless of any other inputs (except OE). Each Y
output bit also has a separate OR input such that a conditional
logic one can be forced at each Y output. This allows jumping
to different microinstructions on programmed conditions.
The 2909/2911 feature three-state Y outputs. These can
be particularly useful in designs requiring external equipment
to provide automatic checkout of the microprocessor. The
internal control can be placed in the high impedance state and
preprogrammed.
MULTIPLEXER SELECT CODES
Table 1 lists the select codes for the multiplexer. The two
bits applied from the microword register (and additional
combinational logic for branching) determine which data
source contains the address for the next microinstruction. The
contents of the selected source will appear on the Y outputs.
Table 1 also shows the truth table for the output control and for
the control of the push/pop stack. Table 2 shows in detail the
effect of S 0, S1, FE and PUP on the 2909. These four signals
define the address that apears on the Y outputs and what the
state of all the internal registers will be following the clock
LOW-to-HlGH edge. In this illustration, the microprogram
counter is assumed to contain initially some word J, the
address register some word K, and the four words in the push/
pop stack contain Ra through Rd.
OR1
ZERO
OE
Y1
X
X
H
L
X
L
H
H
H
L
L
L
Z
L
H
Source selected by S0S1
H = High, L = Low, Z = High Impedance
Table 1a: Output Control
FE
ZERO
H
L
X
H
PUSH-POP stack change
No change
Increment stack pointer, then push
current PC on to STK0
Pop stack (decrement stack pointer)
L
L
H = High, L = Low, X = Irrelevant
Table 1b: Synchronous Stack Control
S1 S2
L
L
H
H
L
H
L
H
Source for Y outputs
Microprogram counter
Address/Holding register
Push-Pop stack
Direct inputs
Symbol
µPC
AR
STKO
D1
Table 1c: Address Selection
3
MA2909/11
Cycle
S1
S0
N
N+1
N
N+1
N
N+1
N
N+1
N
N+1
N
N+1
N
N+1
N
N+1
N
N+1
N
N+1
N
N+1
N
N+1
L
L
FE
PUP
L
L
L
H
H
X
L
L
L
H
H
X
L
L
L
H
H
X
L
L
L
H
H
X
L
L
-
L
L
-
L
H
-
L
H
-
L
H
-
H
L
-
H
L
-
H
L
-
H
H
-
H
H
-
H
H
-
µPC
J
J+1
J
J+1
J
J+1
J
K+1
J
K+1
J
K+1
J
Ra + 1
J
Ra + 1
J
Ra + 1
J
D+1
J
D+1
J
D+1
REG STK0 STK1 STK2 STK3 YOUT
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
Ra
Rb
Ra
J
Ra
Ra
Ra
Rb
Ra
J
Ra
Ra
Ra
Rb
Ra
J
Ra
Ra
Ra
Rb
Ra
J
Ra
Ra
Rb
Rc
Rb
Ra
Rb
Rb
Rb
Rc
Rb
Ra
Rb
Rb
Rb
Rc
Rb
Ra
Rb
Rb
Rb
Rc
Rb
Ra
Rb
Rb
Rc
Rd
Rc
Rb
Rc
Rc
Rc
Rd
Rc
Rb
Rc
Rc
Rc
Rd
Rc
Rb
Rc
Rc
Rc
Rd
Rc
Rb
Rc
Rc
Rd
Ra
Rd
Rc
Rd
Rd
Rd
Ra
Rd
Rc
Rd
Rd
Rd
Ra
Rd
Rc
Rd
Rd
Rd
Ra
Rd
Rc
Rd
Rd
J
J
J
K
K
K
Ra
Ra
Ra
D
D
D
-
Comment
Principal Use
Pop Stack
End Loop
Push µPC
Set-up Loop
Continue
Continue
Pop Stack;
Use AR for Address
Push µPC;
Jump to Address in AR
Jump to Address in AR
End Loop
Jump to Address in
STK0; Pop Stack
Jump to Address in
STK0; Push µPC
RTS
Jump to Address in
STK0
Pop Stack;
Jump to Address on D
Jump to Address on D;
Push µPC
Jump to Address on D
Stack Ref
(Loop)
End Loop
1 = High, 0 = Low, X = Irrelevant, Assume Cn = High
Note: STK0 is the location addressed by the stack pointer
Table 2: Output and Internal Next-Cycle Register States for 2909/2911
Table 3 (Page 5) illustrates the execution of a subroutine
using the 2909. The configuration of Figure 2 is assumed. The
instruction being executed at any given time is the one
contained in the microword register (µWR). The contents of the
µWR also control (indirectly, perhaps) the four signals S0, S1,
FE, and PUP. The starting address of the subroutine is applied
to the D inputs of the 2909 at the appropriate time.
In the column on the left is the sequence of
microinstructions to be executed. At address J+2, the
sequence control portion of the microinstruction contains the
command “Jump to subroutine at A”.
At the time T2, this instruction is in the µWR, and the 2909
inputs are set-up to execute the jump and save the return
address. The subroutine address A is applied to the D inputs
from the µWR and appears on the Y outputs. The first
instruction of the subroutine, I(A), is accessed and is at the
inputs of the µWR. On the next clock transition, l(A) is loaded
into the µWR for execution, and the return address J + 3 is
pushed on to the stack. The return instruction is executed at
T5. Table 4 is a similar timing chart showing one subroutine
linking to a second, the latter consisting of only one
microinstruction.
4
JSR AR
JMP AR
JSR D
JMP D
MA2909/11
Execute Cycle
2909 inputs
(from µWR)
Internal
Registers
2909 Output
ROM Output
Contents of µWR
(instruction
being executed)
T0
S1, S0
FE
PUP
D
µPC
STK0
STK1
STK2
STK3
Y
(Y)
µWR
T1
0
0
H
H
X
X
X
X
J+1
J+2
J+1
J+2
I(J + 1) JSR A
I(J)
I(J + 1)
T2
T3
T4
T5
3
L
H
A
J+3
A
I(A)
0
H
X
X
A+1
J+3
A+1
I(A + 1)
0
H
X
X
A+2
J+3
A+2
RTS
2
L
L
X
A+3
J+3
J+3
I(J + 3)
0
0
H
H
X
X
X
X
J+4
J+5
J+4
J+5
I(J + 4) I(J + 5)
JSR A
I(A)
I(A + 1)
RTS
I(J + 3) I(J + 4)
T6
T7
T8
T9
Table 3: Subroutine Execution
CONTROL MEMORY
Microprogram
Execute
Cycle
T0
T1
T2
T6
T7
T3
T4
T5
Address
Sequencer
Instruction
J-1
J
J+1
J+2
J+3
J+4
A
A+1
A+2
-
JSR A
I(A)
RTS
-
5
MA2909/11
T0
Execute Cycle
2909 inputs
(from µWR)
Internal
Registers
2909 Output
ROM Output
Contents of µWR
(instruction
being executed)
S1, S0
FE
PUP
D
µPC
STK0
STK1
STK2
STK3
Y
(Y)
µWR
T1
0
0
H
H
X
X
X
X
J+1
J+2
J+1
J+2
I(J + 1) JSR A
I(J)
I(J + 1)
T2
T3
T4
T5
T6
T7
T8
T9
3
L
H
A
J+3
A
I(A)
0
H
X
X
A+1
J+3
A+1
I(A + 1)
0
H
X
X
A+2
J+3
A+2
JSR B
2
L
L
X
A+3
J+3
B
RTS
0
H
X
X
B+1
A+3
J+3
A+ 3
I(A + 3)
0
H
X
X
A+4
J+3
A+4
RTS
2
L
L
X
A+5
J+3
J+3
I(J + 3)
0
H
X
X
J+4
J+4
I(J + 4)
JSR A
I(A)
I(A + 1)
JRS B
RTS
I(A + 3)
RTS
I(J + 3)
Table 4: Two Nested Subroutines
CONTROL MEMORY
Microprogram
Execute
Cycle
T0
T1
T2
T9
T3
T4
T5
T7
T8
T6
6
Address
Sequencer
Instruction
J-1
J
J+1
J+2
J+3
A
A+1
A+2
A+3
A+4
B
-
JSR A
JSR B
RTS
RTS
-
MA2909/11
DC CHARACTERISTICS AND RATINGS
Parameter
Min
Max
Units
Supply Voltage
-0.5
7
V
Input Voltage
-0.3
VDD+0.3
V
-
20
mA
Operating Temperature
-55
125
°C
Storage Temperature
-65
150
°C
Current Through Any Pin
Note: Stresses above those listed may cause permanent
damage to the device. This is a stress rating only and
functional operation of the device at these conditions, or at
any other condition above those indicated in the operations
section of this specification, is not implied. Exposure to
absolute maximum rating conditions for extended periods
may affect device reliability.
Table 5: Absolute Maximum Ratings
Subgroup
1
2
3
7
8a
8b
9
10
11
Definition
Static characteristics specified in Table 7 at +25°C
Static characteristics specified in Table 7 at +125°C
Static characteristics specified in Table 7 at -55°C
Functional characteristics at +25°C
Functional characteristics at +125°C
Functional characteristics at -55°C
Switching characteristics specified in Tables 8, 9 and 10 at +25°C
Switching characteristics specified in Tables 8, 9 and 10 at +125°C
Switching characteristics specified in Tables 8, 9 and 10 at -55°C
Table 6: Definition of Subgroups
Symbol
Parameter
Conditions
VOH
VOL
VIH
VIL
IIH
IIL
IOZH
IOZL
IDD
Output high voltage
Output low voltage
Input high level (Note 1)
Input low level (Note 1)
Input high current
Input low current
Tristate high current
Tristate low current
Power supply current
VDD = Min., IOH = -2.6mA, VIN = VIH or VIL
VDD = Max., IOL = 16 mA, VIN = VIH or VIL
Guaranteed input logical high voltage for all inputs
Guaranteed input logical low voltage for all inputs
VIN = VDD (Note 3)
VIN = VSS (Note 3)
VO = VDD (Note 3)
VO = VSS (Note 3)
Min.
Max.
Units
VDD -0.5
VDD/2
-
0.5
0.8
10
-10
50
-50
10
V
V
V
V
µA
µA
µA
µA
mA
NOTES:
Mil-Std-883, Method 5005, Subgroups 1, 2, 3.
1. These input levels provide no guaranteed noise immunity and should only be static tested in a noise-free environment.
2. VDD = 5V ±10%, over full operating temperature range.
3. Guaranteed but not tested at low temperatures.
Table 7: DC Operating Characteristics
7
MA2909/11
Time
Minimum clock low time
Minimum clock high time
15
15
Table 8: Cycle Time and Clock Charcteristics
From input
Y
Cn + 4
From input
Set-up time
Hold Time
D1
S0, S1
ORI
Cn
ZERO
OE LOW (enable) (Note 2)
OE HIGH (disable) (Note 3)
Clock: S1S0 = LH
Clock: S1S0 = LL
Clock: S1S0 = HL
35
30
20
35
25
25
40
40
50
40
35
30
25
40
45
45
45
RE
RI
PUP
FE
Cn
DI
ORI
S0, S1
ZERO
10
10
20
20
15
20
20
20
25
10
7
5
10
5
0
0
0
0
Notes:
1. CL < 50pF
2. RL ≥ 680Ω
3. RL ≥ 680Ω, measured 0.5V change in output level
Table 10: Guaranteed Set-up and Hold Times (all in ns)
All times in ns across full voltage and temperature range.
MIL-STD-883, method 5005, subgroups 9, 10 and 11.
Table 9: Maximum Combinational Propogation Delays
Figure 2
8
MA2909/11
PACKAGE OUTLINES
Millimetres
Ref
Inches
Min.
Nom.
Max.
Min.
Nom.
Max.
A
-
-
5.715
-
-
0.225
A1
0.38
-
1.53
0.015
-
0.060
b
0.35
-
0.59
0.014
-
0.023
c
0.20
-
0.36
0.008
-
0.014
D
-
-
36.02
-
-
1.418
e
-
2.54 Typ.
-
-
0.100 Typ.
-
e1
-
15.24 Typ.
-
-
0.600 Typ.
-
H
4.71
-
5.38
0.185
-
0.212
Me
-
-
15.90
-
-
0.626
Z
-
-
1.27
-
-
0.050
W
-
-
1.53
-
-
0.060
XG404
D
14
1
15
28
REN
1
28 VCC
R3
2
27 CP
R2
3
26 PUP
R1
4
25 FEN
24 Cn+4
R0
5
OR3
6
D3
7
OR2
8
D2
9
20 Y2
OR1 10
19 Y1
23 Cn
Top
View
22 OEN
21 Y3
D1 11
18 Y0
OR0 12
17 S1
D0 13
16 S0
GND 14
15 ZERON
W
ME
Seating Plane
A1
A
C
H
e
b
Z
e1
15°
Figure 3: 28-Lead Ceramic DIL (Solder Seal) - Package Style C
9
MA2909/11
Millimetres
Ref
Inches
Min.
Nom.
Max.
Min.
Nom.
Max.
A
-
-
2.97
-
-
0.117
b
0.381
-
0.482
0.015
-
0.019
c
0.076
-
0.152
0.003
-
0.006
D
18.08
-
18.49
0.712
-
0.728
E
12.50
-
12.9
0.492
-
0.508
E2
9.45
-
9.85
0.372
-
0.388
e
1.143
-
1.40
0.045
-
0.055
L
8.00
-
9.27
0.315
-
0.365
Q
0.66
-
-
0.026
-
-
S
-
-
1.14
-
-
0.045
XG543
E
b
D
S
e
L
A
c
E2
Q
Pin 1
Figure 3: 28-Lead Dual Flatpack (Solder Seal) - Package Style C
10
MA2909/11
RADIATION TOLERANCE
Total Dose (Function to specification)*
3x105 Rad(Si)
Total Dose Radiation Testing
Transient Upset (Stored data loss)
5x1010 Rad(Si)/sec
Transient Upset (Survivability)
>1x1012 Rad(Si)/sec
Neutron Hardness (Function to specification)
>1x1015 n/cm2
Single Event Upset**
1x10-10 Errors/bit day
Latch Up
Not possible
For product procured to guaranteed total dose radiation
levels, each wafer lot will be approved when all sample
devices from each lot pass the total dose radiation test.
The sample devices will be subjected to the total dose
radiation level (Cobalt-60 Source), defined by the ordering
code, and must continue to meet the electrical parameters
specified in the data sheet. Electrical tests, pre and post
irradiation, will be read and recorded.
GEC Plessey Semiconductors can provide radiation
testing compliant with MIL-STD-883 test method 1019,
Ionizing Radiation (Total Dose).
* Other total dose radiation levels available on request
** Worst case galactic cosmic ray upset - interplanetary/high altitude orbit
Table 11: Radiation Hardness Parameters
ORDERING INFORMATION
Unique Circuit Designator
Radiation Tolerance
S
R
Q
MAx2909xxxxx
MAx2911xxxxx
Radiation Hard Processing
100 kRads (Si) Guaranteed
300 kRads (Si) Guaranteed
Package Type
C
N
F
Ceramic DIL (Solder Seal)
Naked Die
Flatpack (Solder Seal)
QA/QCI Process
(See Section 9 Part 4)
Test Process
(See Section 9 Part 3)
Assembly Process
(See Section 9 Part 2)
Reliability Level
For details of reliability, QA/QC, test and assembly
options, see ‘Manufacturing Capability and Quality
Assurance Standards’ Section 9.
L
C
D
E
B
S
Rel 0
Rel 1
Rel 2
Rel 3/4/5/STACK
Class B
Class S
11
MA2909/11
HEADQUARTERS OPERATIONS
CUSTOMER SERVICE CENTRES
GEC PLESSEY SEMICONDUCTORS
Cheney Manor, Swindon,
Wiltshire, SN2 2QW, United Kingdom.
Tel: (01793) 518000
Fax: (01793) 518411
• FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Fax: (1) 64 46 06 07
• GERMANY Munich Tel: (089) 3609 06-0 Fax: (089) 3609 06-55
• ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993
• JAPAN Tokyo Tel: (03) 5276-5501 Fax: (03) 5276-5510
• NORTH AMERICA Scotts Valley, USA Tel: (408) 438 2900 Fax: (408) 438 7023
• SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872
• SWEDEN Stockholm Tel: 46 8 702 97 70 Fax: 46 8 640 47 36
• TAIWAN, ROC Taipei Tel: 886 2 5461260 Fax: 886 2 7190260
• UK, EIRE, DENMARK, FINLAND & NORWAY Swindon, UK
GEC PLESSEY SEMICONDUCTORS
P.O. Box 660017,
1500 Green Hills Road, Scotts Valley,
California 95067-0017,
United States of America.
Tel: (408) 438 2900
Fax: (408) 438 5576
Tel: (01793) 518527/518566 Fax: (01793) 518582
These are supported by Agents and Distributors in major countries world-wide.
© GEC Plessey Semiconductors 1995 Publication No. DS3577-3.3 March 1995
TECHNICAL DOCUMENTATION - NOT FOR RESALE. PRINTED IN UNITED KINGDOM.
This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to
be regarded as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or
service. The Company reserves the right to alter without prior knowledge the specification, design or price of any product or service. Information concerning possible methods of use is provided as a guide
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failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to the Company's conditions of sale, which are available on request.
12
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