Datasheet

33Maxim Integrated
DS2465
DeepCover Secure Authenticator with
SHA-256 Coprocessor and 1-Wire Master Function
ABRIDGED DATA SHEET
Bits 5:0: Block Size (BS). These bits specify the number of bytes to be received and written to the Input Scratchpad
starting at location 00h. If BS = 000000b, one byte is received.
Table 25. Parameter Byte Bitmap
X = Don’t care
1-Wire Receive Block
Command Code E1h
Parameter Byte Block size (Table 25)
Usage
To read memory data
from a secure 1-Wire memory device.
Other Notes
Reads 1 to 63 bytes from the 1-Wire line and makes them accessible from the
scratchpad.
Command Restrictions 1-Wire activity must have ended before this command can be processed.
Error Conditions (Error Response)
Command code is not acknowledged if 1WB = 1 at the time the command code is
received and the command is ignored.
MAC Notes None
I
2
C Busy Duration None
Command Duration
(1 to 63) O 8 O t
SLOT
+ maximum 1.09µs, counted from rising SCL edge of the
parameter byte acknowledge bit.
1-Wire Activity
Begins maximum 1.09µs after the rising SCL edge of the parameter byte
acknowledge bit.
Read Pointer Position 1-Wire Master Status register (for busy polling).
Master Status Bits Affected
1WB (set to 1 for 8 O BS O t
SLOT
).
Master Configurations Affected 1WS, APU apply
1-Wire Port Configurations Affected t
REC0
, t
W1L
, and R
WPU
current values apply.
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
X X BS