IC-TW28 Datasheet, PDF (35/80 Pages) IC-Haus GmbH – 10-BIT SIN/COS INTERPOLATOR

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Encoder Link Write
The Encoder Link write command is 32 bits long and
formatted as shown in Figure 25.
Rev D2, Page 35/80
A+
Bit
A–
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
9
8
7
6
5
4
3
2
1
0
ELink Control Byte
Register Address
Data
Figure 25: Encoder Link Write
The host supplies a serial clock signal to the A+ pin
and writes the command bits (MSB first) to the A– pin.
Command bits are latched on the rising edge of A+.
The ELink command byte determines whether the com-
mand is a read or a write.
A write command is one in which the write bit (wr) is
1. The data byte specified in the write command (bits
7:0) is written to the register address specified in the
command (bits 23:8).
Command
Bit
31
30
29:24
ELink Control Byte
Bit
Name
7
st
6
wr
5:0
–
Description
Start (must be 1)
Write
Reserved (must be 0)
Table 27: ELink Control Byte
Encoder Link Read
The Encoder Link read command is 40 bits long and
formatted as shown in Figure 26.
A+
Bit
A–
3
9
3
8
3
7
3
6
3
5
3
4
3
3
3
2
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
9
8
7
6
5
4
3
2
1
0
ELink Control Byte
Register Address
Wait
Data
Figure 26: Encoder Link Read
A read command is one in which the write bit (wr) of
the ELink control byte is 0. As with the write command,
the host supplies a serial clock signal to the A+ pin
and writes the command bits (MSB first) to the A– pin.
Command bits are latched on the rising edge of A+.
specified in the read command (bits 31:16) to the A- pin
(bits 7:0). The host must sample the data on the rising
edge of A+. At the end of the read command, the A–
pin reverts to being an input and the host must drive it
low to be ready to send the next command.
During the wait byte, the host must stop driving A–. The
iC-TW28 then drives the data from the register address