mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 94

• Manufacturer Part Number: mfrc531
• Description: Iso/iec 14443 Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
13.4.2 Common read/write strobe bus timing
Remark: The signal ALE is not relevant for separate address/data bus and the
multiplexed addresses on the data bus do not care. The multiplexed address and data bus
address lines (A0 to A2) must be connected as described in
Table 159. Common read/write strobe timing specification
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
LHLL
AVLL
LLAX
LLDSL
SLDSL
DSHSH
DSLDV
DSHDZ
DSLQV
DSHQX
DSHRWX
DSLDSH
Fig 20. Separate read/write strobe timing diagram
D0 to D7
A0 to A2
NWR
NCS
NRD
ALE
Parameter
ALE HIGH time
address valid to ALE LOW time
address hold after ALE LOW time
ALE LOW to data strobe LOW time
chip select LOW to data strobe
LOW time
data strobe HIGH to chip select
HIGH time
data strobe LOW to data input valid
time
data strobe HIGH to data input high
impedance time
data strobe LOW to data output
valid time
data output hold after data strobe
HIGH time
RW hold after data strobe HIGH
time
data strobe LOW time
Rev. 3.4 — 26 January 2010
Multiplexed address bus
t
RWHRWL
t
LHLL
t
AVLL
A0 to A2
056634
t
LLAX
t
LLRWL
t
AVRWL
t
SLRWL
Conditions
NWR or NRD
LOW
NCS LOW to
NDS LOW
NDS/NCS LOW
NDS HIGH (write
cycle hold time)
after NDS HIGH
NDS/NCS
Separated address bus
A0 to A2
t
t
WLQV
RLDV
Section 9.1.3 on page
t
RWLRWH
ISO/IEC 14443 reader IC
D0 to D7
Min
20
15
8
15
0
0
-
-
-
8
8
65
MFRC531
© NXP B.V. 2010. All rights reserved.
-
Typ Max Unit
-
-
-
-
-
-
-
-
-
-
-
t
RWHRWL
t
t
t
WHDX
t
RHDZ
RWHSH
WHAX
-
-
-
-
-
-
65
20
35
-
-
-
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8.
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns