Texas Instruments 180 to 100 Pin DIMM Adapter TMDSADAP180TO100 TMDSADAP180TO100 Datenbogen
Produktcode
TMDSADAP180TO100
SPRS825C – OCTOBER 2012 – REVISED FEBRUARY 2014
7.3.3
Enhanced Quadrature Encoder Pulse Module
The eQEP module interfaces directly with linear or rotary incremental encoders to obtain position,
direction, and speed information from rotating machines used in high-performance motion and position-
control systems. There are three Type 0 eQEP modules in each Concerto device.
direction, and speed information from rotating machines used in high-performance motion and position-
control systems. There are three Type 0 eQEP modules in each Concerto device.
Each eQEP peripheral comprises five major functional blocks: Quadrature Capture Unit (QCAP), Position
Counter/Control Unit (PCCU), Quadrature Decoder (QDU), Unit Time Base for speed and frequency
measurement (UTIME), and Watchdog timer for detecting stalls (QWDOG). The C28x CPU controls and
communicates with these modules through a set of associated registers (see
Counter/Control Unit (PCCU), Quadrature Decoder (QDU), Unit Time Base for speed and frequency
measurement (UTIME), and Watchdog timer for detecting stalls (QWDOG). The C28x CPU controls and
communicates with these modules through a set of associated registers (see
). The eQEP
peripherals are clocked by C28SYSCLK, and its registers are accessible by the C28x CPU. This
peripheral clock can be enabled or disabled by flipping a bit in one of the system control registers.
peripheral clock can be enabled or disabled by flipping a bit in one of the system control registers.
Each eQEP peripheral connects through the GPIO_MUX1 block to four device pins. Two of the four pins
are always inputs, while the other two can be inputs or outputs, depending on the operating mode. The
PCCU block of each eQEP also drives one interrupt to the C28x PIE. There is a total of three EQEPxINT
interrupts—one from each of the three eQEP modules.
are always inputs, while the other two can be inputs or outputs, depending on the operating mode. The
PCCU block of each eQEP also drives one interrupt to the C28x PIE. There is a total of three EQEPxINT
interrupts—one from each of the three eQEP modules.
7.3.3.1
eQEP Electrical Data and Timing
shows the eQEP timing requirement and
shows the eQEP switching
characteristics.
Table 7-37. eQEP Timing Requirements
(1)
MIN
MAX
UNIT
t
w(QEPP)
QEP input period
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2[1t
c(SCO)
+ t
w(IQSW)
]
cycles
t
w(INDEXH)
QEP Index Input High time
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+ t
w(IQSW)
cycles
t
w(INDEXL)
QEP Index Input Low time
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+ t
w(IQSW)
cycles
t
w(STROBH)
QEP Strobe High time
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+ t
w(IQSW)
cycles
t
w(STROBL)
QEP Strobe Input Low time
Asynchronous
(2)
/synchronous
2t
c(SCO)
cycles
With input qualifier
2t
c(SCO)
+ t
w(IQSW)
cycles
(1)
For an explanation of the input qualifier parameters, see
(2)
Refer to the F28M36P63C, F28M36P53C, F28M36H53C, F28M36H53B, F28M36H33C, F28M36H33B Concerto MCUs Silicon Errata
(literature number
(literature number
) for limitations in the asynchronous mode.
Table 7-38. eQEP Switching Characteristics
over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
t
d(CNTR)xin
Delay time, external clock to counter increment
4t
c(SCO)
cycles
t
d(PCS-OUT)QEP
Delay time, QEP input edge to position compare sync
6t
c(SCO)
cycles
output
218
Peripheral Information and Timings
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