EZ-USB Datasheet, PDF (98/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

6 EZ-USB Bulk Transfers
6.1 Introduction
AEC
I DNR
NDDC
RP5
Token Packet
D
A
T
A
Payload
Data
0
Data Packet
C
R
A
C
C
1
K
6
H/S Pkt
AEC
I DNR
NDDC
RP5
D
A
T
A
1
Payload
Data
Token Packet
Data Packet
C
R
A
C
C
1
K
6
H/S Pkt
Figure 6-1. Two BULK Transfers, IN and OUT
EZ-USB provides sixteen endpoints for BULK, CONTROL, and INTERRUPT transfers,
numbered 0-7 as shown in Table 6-1. This chapter describes BULK and INTERRUPT
transfers. INTERRUPT transfers are a special case of BULK transfers. EZ-USB CON-
TROL endpoint zero is described in Chapter 7, "EZ-USB Endpoint Zero."
Table 6-1. EZ-USB Bulk, Control, and Interrupt Endpoints
Endpoint Direction
0
Bidir
1
IN
1
OUT
2
IN
2
OUT
3
IN
3
OUT
4
IN
4
OUT
5
IN
5
OUT
6
IN
*6
OUT
7
IN
7
OUT
Type
Control
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Bulk/Int
Size
64/64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
* The highlighted endpoints do not exist in the AN2122 or AN2126. See also Table 1-2.
EZ-USB TRM v1.9
Chapter 6. EZ-USB CPU
Page 6-1