Universal Serial Bus Controller User's Guide

4.61 Maximum Packet Size for Peripheral Host Receive Endpoint (RXMAXP)
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The Maximum Packet Size for Peripheral Host Receive Endpoint (RXMAXP) is shown in Figure 76 and
described in Table 77 .
Figure 76. Maximum Packet Size for Peripheral Host Receive Endpoint (RXMAXP)
15 11 10 0
Reserved MAXPAYLOAD
R-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; - n = value after reset
Table 77. Maximum Packet Size for Peripheral Host Receive Endpoint (RXMAXP) Field Descriptions
Bit Field Value Description
15-11 Reserved 0 Reserved
10-0 MAXPAYLOAD 0-FFh Defines the maximum amount of data that can be transferred through the selected Receive
endpoint in a single frame/microframe (high-speed transfers). The value set can be up to 1024
bytes, but is subject to the constraints placed by the USB Specification on packet sizes for Bulk,
Interrupt, and Isochronous transfers in full-speed and high-speed operations. The value written to
this register should match the wMaxPacketSize field of the Standard Endpoint Descriptor for the
associated endpoint. A mismatch could cause unexpected results.
Universal Serial Bus (USB) Controller124 SPRUGH3 – November 2008
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