Cirrus Logic EP73xx - Manual (Page 64)

5-4 EP7309/11/12 User’s Manual - DS508UM4
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Copyright Cirrus Logic, Inc. 2003
System Registers
5
MaverickKey
™
Unique-ID
MaverickKey registers are unique ID numbers that are programmed for use in secure
web content and commerce. These IDs, burned into specific register locations give the
OEMs a method for SDMI (Secure Digital Music Initiative) or any other
authentication mechanism.
There is a single 32-bit Unique ID as well as a 128-bit random ID and are laser
programmed at the factory. These numbers can be used to match secure or
copyrighted content with the ID of the 73xx device for the purpose of transmitting
said information over a secure connection.
The Unique ID is located at 0x8000.2440. The 128-bit random ID can be found at
0x8000.2700-270C.
System Control Register Descriptions
System Control Register 1 (SYSCON1)
Address: 0x8000.0100, Read / Write
Definition: The SYSCON1 system control register is a 21-bit read/write register
which controls some of the general configuration parameters for the
EP73xx as well as the control and status of internal peripherals. All
bits in this register are cleared upon system reset (nSYSRES).
Bit Descriptions:
Keyboard Scan:This four bit field defines the state of the keyboard column
driver. The following table defines these states.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RSVD IRTXM WAKEDI
S
EXCKE
N
ADCKSEL
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SIREN CDENRX CDENT
X
LCDEN DBGEN BZMOD BZTOG UART1E
N
TC2S TC2M TC1S TC1M Keyboard Scan
Table 5-2: Keyboard Column Drive State
Value Column Drive State
0 All high
1 All low
2-7 All Hi-Z (tristate)
8 Column 0 high, all others Hi-Z
9 Column 1 high, all others Hi-Z
10 Column 2 high, all others Hi-Z