SAA1575HL Datasheet, PDF (31/56 Pages) NXP Semiconductors – Global Positioning System GPS baseband processor

Philips Semiconductors
Global Positioning System (GPS)
baseband processor
Product specification
SAA1575HL
SYMBOL
PARAMETER
CONDITIONS
External data memory write; see Fig.19
t_AVAU
t_WLDL
t_W(DMCS)
t_WHDH
address valid time
WRH and WRL asserted to DMCS asserted
DMCS pulse width
WRH and WRL de-asserted to DMCS
de-asserted
t_AVWL
t_WLWH
t_AVQV
t_QVWL
t_WHAU
address valid to WRH and WRL asserted
WRH and WRL pulse width
address valid to data valid
data valid to WRH and WRL de-asserted
WRH and WRL de-asserted to address
undefined
t_h(D)
data hold time after WRH and WRL
de-asserted
note 1
GPS IF input timing; see Fig.20
t_FVSH
t_SHFV
IF set-up time before rising edge of SCLK
IF hold time after rising edge of SCLK
1 second pulse output; see Fig.21
t_W(T1S)
T_T1S
T1S pulse width
T1S pulse period
note 2
Notes
1. For default DCMS operation.
2. The 1 s pulse output is only valid when at least one channel is locked.
MIN. TYP. MAX. UNIT
164.7 −
−
ns
−
2.0
4.0
ns
65.7 −
−
ns
−
2.0
4.0
ns
63.7 −
−
ns
64.7 65.7 −
ns
67.7 −
−
ns
−9.0 −4.0 −
ns
2.0
−
−
ns
0
1.0
−
ns
−
10
−
ns
0
−
−
ns
−
1.0
−
µs
−
1.0
−
s
Table 4 Explanation of symbol characters in Chapter “AC characteristics”
SYMBOL CHARACTER
A
C
D
E
I
P
Q
R
W
H
L
U
V
Z
DESCRIPTION
address
clock
input data
DMCS strobe
instruction (program memory)
PCMS strobe
output data
RD
WRH or WRL strobes
logic high
logic low
undefined
valid
high impedance or pull-up
1999 Jun 04
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