Cypress EZ-USB FX3 User Manual

EZ-USB FX3 Technical Reference Manual, Document Number: 001-76074 Rev. *F 418
EEPM_CS
0xE0031C00
10.13 USB End Point Manager Registers
10.13.1 EEPM_CS
Egress EPM Retry Buffer Status Register
This register provides the status of the retry buffer in the Egress EPM for debug purposes only. In SuperSpeed mode, the
retry buffer is a circular buffer of 16x1KB holding the last packets bursted out. Software is expected to 'unroll' the correspond-
ing socket when a retry buffer is flushed by the protocol layer (based on Protocol Layer error interrupts). In High-Speed mode,
there is a single 1-KB retry buffer for each endpoint. The data contained can remain in the buffer indefinitely; there is no need
for a software rollback in this case.
31:28 EG_EPNUM[3:0] Active Endpoint Number
21:18 URUN_EP_NUM[3:0] The Endpoint that the underrun occurred.
17 URUN_REPAIR_TIMEOUT_EN If an under run occurs and the URUN_REPAIR_EN is set and this register bit is set, then
EPM will start a timer (16-bit counter). If the repair is not complete after 65535*epm clock,
EPM will raise the UIB_INTR.EPM_URUN_TIMEOUT interrupt.
continued on next page
EEPM_CS Egress EPM Retry Buffer Status 0xE0031C00
b31 b30 b29 b28 b27 b26 b25 b24
EG_EPNUM[3:0]
RRRR
R/W R/W R/W R/W
0000
EEPM_CS Egress EPM Retry Buffer Status
b23 b22 b21 b20 b19 b18 b17 b16
URUN_EP_NUM[3:1]
URUN_REPAIR_
TIMEOUT_EN
URUN_REPAIR_
EN
RRRRR/WR/W
R/W R/W R/W R/W R R
000011
EEPM_CS Egress EPM Retry Buffer Status
b15 b14 b13 b12 b11 b10 b9 b8
VALID_PACKETS[15:8]
RRRRRRRR
R/W R/W R/W R/W R/W R/W R/W R/W
00000000
EEPM_CS Egress EPM Retry Buffer Status
b7 b6 b5 b4 b3 b2 b1 b0
VALID_PACKETS[7:0]
RRRRRRRR
R/W R/W R/W R/W R/W R/W R/W R/W
00000000
Bit Name Description

Cypress EZ-USB FX3 Specifications

General

Brand	Cypress
Model	EZ-USB FX3
Category	Controller
Language	English