Caravel Rev 5B eval/development board found in hardware/development/caravel-dev-v5-M.2 has an incorrect/misleading label on J6 (and somewhat misleading on J2), it seems.
Here's J6:
The label (EN-bar) implies that this is an active-low-ENABLE, and hence that jumpering J6 -- i.e. pulling pin 1 (OSC_EN) low -- would enable the oscillator. In fact, it will do the opposite: The datasheet for part DSC6001 (ref X1) confirms that this an active-low-DISABLE (and when left floating it is pulled high to ENABLE).
I reckon the circuit is correct, and just the label is wrong, i.e. it's designed this way so that the on-board oscillator can be disabled and an external clock source can be supplied to xclk via header pin J11[19].
Should the label be OSC /DIS (bar over DIS) perhaps, since the intended use of this jumper is really to disable the oscillator?
NOTE: Looks like a similar confusing label with J2:
Maybe this should be labelled UART DIS (no bar) because shorting J2 will pull it HIGH and disable the UART, but it's tricky since the actual pin (pin 2) of this jumper is, in fact, the actual /UART_EN line.
Caravel Rev 5B eval/development board found in hardware/development/caravel-dev-v5-M.2 has an incorrect/misleading label on J6 (and somewhat misleading on J2), it seems.
Here's J6:
The label (
EN-bar) implies that this is an active-low-ENABLE, and hence that jumpering J6 -- i.e. pulling pin 1 (OSC_EN) low -- would enable the oscillator. In fact, it will do the opposite: The datasheet for part DSC6001 (ref X1) confirms that this an active-low-DISABLE (and when left floating it is pulled high to ENABLE).I reckon the circuit is correct, and just the label is wrong, i.e. it's designed this way so that the on-board oscillator can be disabled and an external clock source can be supplied to
xclkvia header pin J11[19].Should the label be
OSC /DIS(bar over DIS) perhaps, since the intended use of this jumper is really to disable the oscillator?NOTE: Looks like a similar confusing label with J2:
Maybe this should be labelled
UART DIS(no bar) because shorting J2 will pull it HIGH and disable the UART, but it's tricky since the actual pin (pin 2) of this jumper is, in fact, the actual/UART_ENline.