Programming Model
MOTOROLA
SmartCard Interface Module (SIM)
25-35
25.6.11 Transmit Threshold Register
The bit descriptions and settings for the Transmit Threshold Register (XMT_THRESHOLD) are provided
in Table 25-19.
XMT_THRESHOLD
Transmit Threshold Register
Addr
0x00211028
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
XTH
TDT
TYPE
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
o
0
0
0
0
0x000
Table 25-19. Transmit Threshold Register Description
Name
Description
Settings
Reserved
Bits 31–8
Reserved—These bits are reserved and should read 0.
XTH
Bits 7–4
Transmit NACK Threshold
—Sets the NACK
threshold for the transmitter. When the threshold
number set by XTH has been reached for the
current byte being transmitted, the error flag XTE
in the XMT_STATUS register is set. When XTE is
set, the remaining transmissions queued in the
transmit FIFO are aborted and no more
transmissions occur until software clears XTE. To
trigger XTE, a given byte being transmitted must
reach the XTH threshold itself. Transmit NACKs
accumulated on one byte are not carried over to
the next.
0000
=
XTE is not set, retransmission after NACK
reception is disabled
0001
=
XTE sets after 1 NACK is received,
0 retransmissions occur.
0010
=
XTE sets after 2 NACKs are received,
a maximum of 1 retransmission occurs.
...
1111
=
XTE sets after 15 NACKs are received,
a maximum of 14 retransmissions occurs.
TDT
Bits 3–0
Transmit Data Threshold
—Sets the threshold value for the Transmit FIFO at which the TDTF bit in
the XMT_STATUS register is set. When the number of bytes in the Transmit FIFO is less than or
equal to TDT, TDTF is set.
Summary of Contents for DragonBall MC9328MX1
Page 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
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Page 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
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Page 670: ...24 72 MC9328MX1 Reference Manual MOTOROLA SDRAM Memory Controller ...
Page 726: ...25 56 MC9328MX1 Reference Manual MOTOROLA SmartCard Interface Module SIM ...
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