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RF6001
Rev A3 DS050929
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Part of the POLARIS™ TOTAL RADIO™ Solution
GMSK to GMSK EALGN=1, “Alternate” FIFO Mode
The quarter symbol shift CAN be accounted for by setting EALGN to 1. The diagram below presents this situation.
As before there will be a glitch at the rising edge of TX_ST due to the clock reset function causing a phase discontinuity. This
occurs during minimum output power and should not be a problem.
GMSK to GMSK EALGN=1, “Alternate” Serial Mode
If the serial mode interface is used instead if the FIFO then the diagram below presents the transition.
Data changes at MDI on the rising edges of MCK and is read on the falling edges of MCK.
In this diagram G_CNT is set to three to blank the first three serial bits from the baseband system. G_DEF fills the three gar-
bage symbols.
If the serial mode interface is used with MS then the only difference is that MS will pulse on the last G_CNT count.
TXST
Center of first
tail bit
tail
tail
tail
Center of last
tail bit
tail
tail
data
data
Effective
FIFO output
clock
0
First GMSK bit
of next slot
clocks reset
tail
0
tail
22 qst
37qst
tail
G_DLY
1
1
1
17 qst to
19 qst
RD_DLY=
G_DEF
12 qst
RU_DLY=
tail
data
tail
tail
12 qst
tail
tail
data
tail
tail
tail
tail
G_DLY
G_DEF
GMSK mod
Noise pulse due clock
reset
DAC1
Data at RF due to
GMSK Modulator
Data at
FIFO output
Data at GMSK
Mod Input
Center of first
tail bit
Center of last
tail bit
tail
tail
34qst
37 qst
12 qst
tail
data
data
0
tail
0
data
data
19 qst tp 21
qst
RD_DLY=
RU_DLY= 26qst
garbage
X
tail
tail
tail
data
data
Garbage Bits
G_CNT=3
G_DEF
First GMSK bit
for next slot
garbage
X
garbage
X
G_DEF
G_DLY
G_DLY
clocks reset
tail
tail
tail
tail
tail
tail
tail
tail
tail
GMSK mod
Noise pulse due clock
reset
TXST
DAC1
Modulator
input
MCK
MDI
Data at RF
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