JAJSII9E april 2020 – june 2023 DRA821U , DRA821U-Q1
PRODUCTION DATA
デバイスごとのパッケージ図は、PDF版データシートをご参照ください。
For more details about features and additional description information on the device IEEE 1149.1 Standard–Test–Access Port, see the corresponding sections within Section 6.3, Signal Descriptions and Section 8, Detailed Description.
Table 7-84 represents JTAG timing conditions.
The JTAG signals are split across two IO power domains on the device. Timings parameters defined in this section only apply when the two IO power domains are operating at the same voltage and level-shifters are not inserted into the signal path. Values for the following timing parameters are not defined when operating the two IO power domains at different voltages since propagation delay through the device IO buffers differ when some are operating at 1.8V while others are operating at 3.3V. This effectively reduces timing margin beyond the values defined in this section. The JTAG interface is still expected to function when the two IO power domains are operated at different voltages, assuming the system designer has implemented appropriate level-shifters and the operating frequency is reduced to accommodate additional delay inserted by the level-shifters and IO buffers operating at different voltages
PARAMETER | MIN | MAX | UNIT | |
---|---|---|---|---|
Input Conditions | ||||
tSR | Input slew rate | 0.50 | 2.00 | V/ns |
Output Conditions | ||||
CL | Output load capacitance | 5 | 15 | pF |
PCB CONNECTIVITY REQUIREMENTS | ||||
td(Trace Delay) | Propagation delay of each trace | 83.5 | 1000(1) | ps |
td(Trace Mismatch Delay) | Propagation delay mismatch across all traces | 100 | ps |