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MU9C1480A Datasheet PDF : 28 Pages
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MU9C1480A/L Draft
OPERATIONAL CHARACTERISTICS Continued
Case
1
2
3
4
5
62
Internal Internal External
/EC(int) /MA (int)
/MI
Device Select Command Data Write Command Data Read
Register
Write1
Read
1
X
X
DS=FFFFH
YES3
YES4
NO
NO
1
X
X
DS=PA
YES3
YES4
YES
YES
1
X
X
DS≠FFFFH and
NO
NO
NO
NO
DS≠PA
0
X
0
X
NO
NO
NO5
NO
0
1
1
X
NO
NO
NO5
NO
0
0
1
X
YES3
YES4
YES5
YES
Table 5a: Standard Mode Device Select Response
Case
Internal Internal External
/EC(int) /MA (int)
/MI
Device select Command Data Write Command Data Read
Register
Write1
Read
1
1
X
X
DS = FFFFH
YES3
YES4
NO
NO
2
1
X
X
DS = PA
YES3
YES4
YES
YES
3
1
X
X
DS ≠FFFFH
NO
NO
NO
NO
and DS ≠PA
4
0
0
0
5
0
1
X
62
0
0
1
X
YES3,6
YES4,7
NO5
NO
X
YES3,6
YES4,7
NO5
NO
X
YES3
YES4
YES5
YES
NOTES:
Table 5b: Enhanced Mode Device Select Response
1. Exceptions are:
A) A write to the Device Select register is always active in all devices;
B) A write to the Page Address register is active in the device with /FI LOW and /FF HIGH; and
C) The Set Full Flag (SFF) instruction is active in the device with /FI LOW and /FF HIGH.
2. If /MF is disabled in the Control register, Internal /MA is forced HIGH preventing a Case 6 response.
3. This is NO for a MOV instruction involving Memory at Next Free address if /FI is HIGH or the device is full.
4. This is NO if the Persistent Destination is Memory at Next Free address and /FI is HIGH or the device is full.
5. For a Command read following a TCO NF instruction, this is YES if the device contains the first empty location in a daisy chain
(i.e., /FI LOW and /FF HIGH) and NO if it does not.
6. This is NO for a MOV or VBC instruction involving Memory at Highest-Priority match.
7. This is NO if the Persistent Destination is Memory at Highest-Priority match.
Match Flag Cascading
The Match Flag daisy chain cascading is used for three
purposes: first, to allow operations on Highest-Priority
Match addresses to be issued globally over the whole
string; second, to provide a system wide match flag; third,
to lock out all devices except the one with the
Highest-Priority match for instructions such as Status reads
after a match. The Match flag logic causes only the
highest-priority device to operate on its Highest-Priority
Match location while devices with lower-priority matches
ignore Highest-Priority Match operations. The lock-out
feature is enabled by the match flag cascading and the use
of the /EC control signal, as shown in Tables 5a and 5b.
/E
/EC
/EC (INT )
/MF
Figure 6: /EC (Int) Timing Diagram
13
Rev. 3.0 Draft
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