mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 520

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

IEEE 1149.1 (JTAG) AC Timing Specifications
Figure 23-22 shows USB timings listed in Table 23-22.
23.12 IEEE 1149.1 (JTAG) AC Timing Specifications
Table 23-23 lists JTAG timings.
23-26
1
2
Name
Name
US6
US7
US8
J2a
J2b
USB_CLK accuracy should be +- 500ppm or better. USB_CLK may be stopped to conserve power.
Specification values are not tested.
J1
—
TCK frequency of operation
TCK cycle time
TCK clock pulse high width measured at 1.5 V
TCK clock pulse low width measured at 1.5 V
USB Inputs (USB_RP, USB_RN, USB_RxD) hold time from USB_CLK (rising)
USB_CLK to USB outputs valid (USB_TP, USB_TN, USB_SUSP, USB_TxEN)
USB_CLK to USB outputs invalid (output hold) (USB_TP, USB_TN, USB_SUSP,
USB_TxEN)
USB_CLK
Table 23-22. USB Interface AC Timing Specifications (Continued)
USB_SUSP
USB_TxEN
USB_RxD
USB_RN
USB_RP
USB_TN
USB_TP
Table 23-23. IEEE 1149.1 (JTAG) AC Timing Specifications
USB signals are sampled; setup and hold times are not
normally required in a transceiver connection.
(input)
US4a
Figure 23-22. USB Interface Timing
US5
Characteristic
Characteristic
US7
MCF5272 User’s Manual
US1
NOTE:
US6
US8
US2
US4b
V
V
h
l
Min
100
40
40
0–66 MHz
0
Min
48-66 MHz
—
6
3
US3
Max
10
—
—
—
Max
MOTOROLA
—
12
—
MHz
Unit
Unit
nS
nS
nS
nS
nS
nS