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@@ -12,7 +12,8 @@ care" and write as 0.
## IP Block: `cds9k-fan`
- FIXME add description
+The CDS9K fan control block allows PWM speed control of a single fan, and
+readback of the fan's tachometer.
### Register 0x0: FAN\_PWM
@@ -34,11 +35,12 @@ i.e. a linear scaling from 0-100% to 0x0-0xFF
Mode: read-only
-Read this register to determine the fan tachometer reading (FIXME units TBD).
+Read this register to determine the fan tachometer reading in revolutions per
+minute (RPM).
| Bits | 15 - 0 |
| ---- | -------- |
-| Use | reserved |
+| Use | fan\_rpm |
## IP Block: `cds9k-led`