參數(shù)資料
型號: MFRC50001T
廠商: NXP Semiconductors N.V.
元件分類: 通信及網(wǎng)絡
英文描述: Highly integrated ISO-IEC 14443 A reader IC
封裝: MFRC50001T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 15, 2005,;
文件頁數(shù): 36/110頁
文件大?。?/td> 841K
代理商: MFRC50001T
MFRC500_33
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NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.3 — 15 March 2010
048033
36 of 110
NXP Semiconductors
MFRC500
Highly Integrated ISO/IEC 14443 A Reader IC
9.12.1
Crypto1 key handling
On execution of the authentication command, the MFRC500 reads the key from the key
buffer. The key is always read from the key buffer and ensures Crypto1 authentication
commands do not require addressing of a key. The user must ensure the correct key is
prepared in the key buffer before triggering card authentication.
The key buffer can be loaded from:
the EEPROM using the LoadKeyE2 command (see
Section 11.6.1 on page 81
)
the microprocessor’s FIFO buffer using the LoadKey command (see
Section 11.6.2
on page 81
). This is shown in
Figure 13
.
9.12.2
Authentication procedure
The Crypto1 security algorithm enables authentication of MIFARE cards. To obtain valid
authentication, the correct key has to be available in the key buffer of the MFRC500. This
can be ensured as follows:
1. Load the internal key buffer by using the LoadKeyE2 (see
Section 11.6.1 on page 81
)
or the LoadKey (see
Section 11.6.2 on page 81
) commands.
2. Start the Authent1 command (see
Section 11.6.3 on page 82
). When finished, check
the error flags to obtain the command execution status.
3. Start the Authent2 command (see
Section 11.6.4 on page 82
). When finished, check
the error flags and bit Crypto1On to obtain the command execution status.
Fig 13. Crypto1 key handling block diagram
001aak624
FIFO BUFFER
from the microcontroller
WriteE2
LoadKey
EEPROM
KEYS
KEY BUFFER
LoadKeyE2
during
Authent1
CRYPTO1
MODULE
serial data stream out
(encrypted)
serial data stream in
(plain)
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