參數(shù)資料
型號: CLRC632
廠商: NXP Semiconductors N.V.
英文描述: Multiple Protocol Contactless Reader IC
中文描述: 多協(xié)議非接觸式讀卡器IC
文件頁數(shù): 118/163頁
文件大小: 948K
代理商: CLRC632
Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
118
Confidential
If
TxLastBits
is unequal zero the last byte is not transmitted completely, but only the number of bits set in
TxLastBits
are transmitted (starting with the least significant bit).
Thus, the internal state machine has to check the FIFO status at an earlier point in time (shown in the figure
below).
Since
TxLastBits
= 4 in this example, transmission stops after Bit 3 is transmitted. If configured, the frame is
completed with an EOF.
The figure above also shows a write access to the
FIFOData Register
right before the FIFO’s status is
checked. This leads to ‘FIFO empty’ going to 0 again and therefore ‘Accept Further Data’ stays active. The
new byte written is transmitted via the RF-interface.
‘Accept Further Data’ is changed only by the ‘Check FIFO empty’ function. This function verifies ‘FIFO empty’
one bit duration before the last expected bit transmission.
Frame Definition
Verification at:
8 Bit with Parity
8
th
Bit
8 Bit without Parity
7
th
Bit
x Bit without Parity
(x-1)
th
Bit
FIFO Length
FIFO empty
0x01
0x00
TxLastBits = 4
TxLastBits
Bit0
Bit7 Bit0
TxData
Check FIFO empty
Accept Further Data
Bit7
Bit3 Bit4
N_WR (FIFO Data)
0x00
0x01
Bit3
Bit4
Figure 18-3: Timing for Transmitting Bit Oriented Frames
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