參數(shù)資料
型號： HFA3841
廠商： Intersil Corporation
英文描述： 288 MACROCELL 3.3 VOLT ISP CPLD
中文描述： 無線局域網(wǎng)媒體訪問控制器
文件頁數(shù)： 23/27頁
文件大?。?/td> 211K
代理商： HFA3841
23
BBP Packet Transmission
There are 4 signals associated with the BBP Transmit Port:
TX_PE (transmit enable), TXRDY (transmit ready), TXD
(transmit data), and TXCLK (transmit clock). These connect
to the HFA3841 on PL0, PL7, TXD, and TXC, respectively.
State machines within the BBP control packet transmission
and reception. In the case of a transmission, the MAC
signals the BBP with the signal TX_PE. The BBP forms the
preamble and header and then signals the MAC to begin
transferring data with the signal TXRDY. This sequence is
illustrated in Figure 22 with detailed signal timing shown in
Figure 23 and specified delays contained in Table 3. Note
that if the MAC deactivates TX_PE too early it may cut off
modulation of the final symbol. For this reason, when
TX_PE is de-asserted the BBP will hold TXRDY active until
the last symbol containing data is modulated. This is
important for power sequencing and is discussed in more
detail in that section.
For more detailed information concerning BBP packet
transmission see the HFA3861 data sheet.
TABLE 2. BBP RECEIVE PORT AC ELECTRICAL
SPECIFICATIONS
PARAMETER
SYMBOL
MIN
MAX
UNITS
RX_PE Inactive Width
t
RLP
70
-
ns (Note 13)
RXC Period (11MBps
Mode)
t
RCP
77
-
ns
RXC Width Hi or Low
(11MBps Mode)
t
RCD
31
-
ns
RXC to RXD
t
RDD
20
60
ns
MD_RDY to 1st RXC
t
RD1
940
-
ns (Note 14)
RXD to 1st RXC
t
RD!
940
-
ns
Setup RXD to RXC
t
RDS
31
-
ns
RXC to RX_PE
Inactive (1MBps)
t
REH
0
925
ns (Note 15)
RXC to RX_PE
Inactive (2MBps)
t
REH
0
380
ns (Note 15)
RXC to RX_PE
Inactive (5.5MBps)
t
REH
0
140
ns (Note 15)
RXC to RX_PE
Inactive (11MBps)
t
REH
0
50
ns (Note 15)
RX_PE inactive to
MD_RDY Inactive
t
RD2
5
30
ns (Note 16)
Last Chip of SFD in to
MD_RDY Active
t
RD3
2.77
2.86
μ
s (Note 14)
RX Delay
2.77
2.86
μ
s (Note 17)
RX_PE to CCA Valid
t
CCA
-
10
μ
s (Note 18)
RX_PE to RSSI Valid
t
CCA
-
10
μ
s (Note 18)
NOTES:
13. RX_PE must be inactive at least 3 MCLKs before going active to
start a new CCA or acquisition.
14. MD_RDY programmed to go active after SFD detect (measured
from I
IN
, Q
IN
).
15. RX_PE active to inactive delay to prevent next RXC.
16. Assumes RX_PE inactive after last RXC.
17. MD_RDY programmed to go active at MPDU start. Measured
from first chip of first MPDU symbol at I
IN
, Q
IN
to MD_RDY
active.
18. CCA and RSSI are measured once during the first 10
μ
s interval
following RX_PE going active. RX_PE must be pulsed to initiate
a new measurement. RSSI may be read via serial port or from
Test Bus.
TABLE 3. BBP TRANSMIT PORT AC ELECTRICAL
SPECIFICATIONS
PARAMETER
SYMBOL
MIN
MAX
UNITS
TX_PE to I
OUT
/Q
OUT
(1st Valid Chip)
t
D1
2.18
2.3
μ
s (Note 19)
TX_PE Inactive Width
t
TLP
2.22
-
μ
s (Note 20)
TXC Width Hi or Low
t
TCD
40
-
ns
TXRDY Active to 1st
TX_CLK Hi
t
RC
260
-
ns
Setup TXD to TXC Hi
t
TDS
30
-
ns
Hold TXD to TXC Hi
t
TDH
0
-
ns
TXC to TX_PE
Inactive (1MBps)
t
PEH
0
965
ns (Note 22)
TXC to TX_PE
Inactive (2MBps)
t
PEH
0
420
ns (Note 22)
TXC to TX_PE
Inactive (5.5MBps)
t
PEH
0
160
ns (Note 22)
TXC to TX_PE
Inactive (11MBps)
t
PEH
0
65
ns (Note 22)
TXRDY Inactive To
Last Chip of MPDU
Out
t
RI
-20
20
ns
TXD Modulation
Extension
t
ME
2
-
μ
s (Note 21)
NOTES:
19. I
OUT
/Q
OUT
are modulated before first valid chip of preamble is
output to provide ramp up time for RF/IF circuits.
20. TX_PE must be inactive before going active to generate a new
packet.
21. I
OUT
/Q
OUT
are modulated after last chip of valid data to provide
ramp down time for RF/IF circuits.
22. Delay from TXC to inactive edge of TXPE to prevent next TXC.
BecauseTXPEasynchronouslystopsTXC,TXPEgoinginactive
within 40ns of TXC will cause TXC minimum hi time to be less
than 40ns.
Preliminary - HFA3841
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