AS3991-BQFT austriamicrosystems, AS3991-BQFT Datasheet - Page 37

• Manufacturer Part Number: AS3991-BQFT
• Description: IC UHF RFID READER 64-QFN
• Manufacturer: austriamicrosystems

Specifications of AS3991-BQFT

• Rf Type: Read / Write
• Frequency: 840MHz ~ 960MHz
• Features: ISO-18000-6
• Package / Case: 64-VFQFN, Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS3991-BQFT; AS3991-BQFTTR

AS3990/AS3991
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
RX Length 2 (1B)
Table 40. RX Length 2 (1B)
1. Default: reset to 00 at por=H, EN=L and at the end of successful reception
FIFO Control Registers
FIFO status – adr 1C hex number of received bytes and FIFO flags.
Table 41. FIFO Status- adr 1C hex
1. Default: reset to 00 at por=H and EN=L
TX Length Byte1 – adr 1D hex high 2 nibbles of complete bytes, which will be transferred through FIFO.
Table 42. TX Length Byte1 - adr 1D hex
1. Default: reset to 00 at por=H and EN=L. It is also automatically reset at TX EOF
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Bit
Bit
Bit
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
Signal Name
Signal Name
Signal Name
rxl<7>
rxl<6>
rxl<5>
rxl<4>
rxl<3>
rxl<2>
rxl<1>
rxl<0>
Txl10
Txl11
Fove
Txl9
Txl8
Txl7
Txl6
Txl5
Txl4
Fb4
Fb3
Fb2
Fb1
Fb0
1
Fhil
Flol
1
1
High FIFO level
Low FIFO level
FIFO overflow error
FIFO bytes fb[4]
FIFO bytes fb[3]
FIFO bytes fb[2]
FIFO bytes fb[1]
FIFO bytes fb[0]
number of complete byte– bn[11]
number of complete byte– bn[10]
number of complete byte– bn[9]
number of complete byte– bn[8]
number of complete byte– bn[7]
number of complete byte– bn[6]
number of complete byte– bn[5]
number of complete byte– bn[4]
Function
RX length
Function
Revision 3.81
Function
Indicates that 18 bytes are in FIFO already (for RX)
Indicates that only 6 bytes are left in FIFO (for TX)
Several data is written to FIFO
How many bytes loaded in FIFO were not read out yet
RX length defines the number of bits that
the receiver should receive. The number of
bits is taken into account only in case the
value is different than 00, otherwise receiver
stops on pause at the end of reception.
Since in noisy environment, the end of
transmission is purely defined using of RX
length improves the probability for
successful receiving. For direct commands
98 to 9C, the RX length is internally set to
16 to receive RN16. For direct command 9F,
the RX length is internally set to 32 to
receive RN16 and CRC.
High nibble of complete bytes to be
transmitted or received.
Middle nibble of complete bytes to be
transmitted or received.
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