IC-TW14 Datasheet, PDF (28/33 Pages) IC-Haus GmbH – IC-PMX Companion Chip

iC-TW14
iC-PMX Companion Chip
Rev A1, Page 28/33
Diagnostic Mode 2
Diagnostic mode 2 (MODE/CMD = 2 or 3) is used to
analyze current ramp operation and set the PMXBIAS
value. Initiate diagnostic mode 2 using the DIAG2P (2)
or DIAG2N (3) commands. See MODE/CMD on page
19 for more information.
Diagnostic mode 2 is most easily used via the Current
Ramp tab in the free iC-TW14 GUI software as shown
in Figure 8.
Figure 8: Typical Wiegand Pulse Data
See PMX BIAS and CURRENT RAMP PARAMETERS
in iC-PMX application note 2 for more information on
using diagnostic mode 2.
Diagnostic mode 2 sets STATUS.STOP. To clear
this condition, re-synchronize the iC-TW14 using the
RESYNC command (8).
DIRECT FRAM ACCESS
The iC-TW14 contains an FRAM block address regis-
ter, four FRAM data registers, and five additional com-
mands which are used to directly access the FRAM
connected to the iC-PMX for diagnostics or storage of
user data.
FRAM_BLOCK
FRAM_BLOCK is a read/write register used to specify
the block address for reading data from or writing data
to the FRAM using the F_DATA_W (21) and F_DATA_R
(22) commands. See Direct FRAM Access Commands
on page 29 for more information.
processing. FRAM_BLOCK specifies the starting loca-
tion of the desired data block and is calculated as
FRAM Address
FRAM_BLOCK =
8
For example, to access the block of FRAM data starting
at address 0x40, set FRAM_BLOCK = 0x0008.
FRAM_BLOCK (0x31)
Bits
Description
15:8
Reserved (must be 0)
7:0
FRAM Address/ 8
Table 55: FRAM Block Address Register
DATA Registers
DATA.0 – DATA.3 are read/write registers used to hold
the data being written to or read from the FRAM using
commands 21 – 25. The data stored in these registers
is different depending on the specific command used.
See Direct FRAM Access Commands on page 29 for
more information.
Data in the FRAM is accessed in 8-byte blocks. This The 8 byte block of FRAM data used by the F_DATA_W
provides efficient use of the iC-PMX to FRAM commu- (21) and F_DATA_R (22) commands is stored in
nication channel while still permitting Wiegand pulse DATA.0 – DATA.3 as shown in Table 56.