* BIT1 - USB reset interrupt.
* BIT0
-# 0x3F ZM_EP_IN_MAX_SIZE_HIGH_OFFSET
-
# 0x3E ZM_EP_IN_MAX_SIZE_LOW_OFFSET
+# 0x3F ZM_EP_IN_MAX_SIZE_HIGH_OFFSET
+* BIT7
+* BIT6
+* BIT5
+* BIT4 - mUsbEPinRsTgSet
+* BIT3 - mUsbEPinStallSet
+* BIT2
+* BIT1
+* BIT0
+These offset + 2 Byte step for each endpoint.
+For example EP0 = +0x00; EP1 = +0x02; or offset+(EPn << 1).
+
# 0x5E ZM_EP_OUT_MAX_SIZE_LOW_OFFSET
# 0x5F ZM_EP_OUT_MAX_SIZE_HIGH_OFFSET
+* BIT7
+* BIT6
+* BIT5
+* BIT4 - mUsbEPoutRsTgSet
+* BIT3 - mUsbEPoutStallSet
+* BIT2
+* BIT1
+* BIT0
+These offset + 2 Byte step for each endpoint.
+For example EP0 = +0x00; EP1 = +0x02; or offset+(EPn << 1).
# 0xAE ZM_EP3_BYTE_COUNT_HIGH_OFFSET
BIT3 - 1 xfer done?