Figure 6-9.
Interrupt Service Routine (ISR) for Endpoint 6-OUT ..................................... 6-19
Figure 6-10. Background Program Transfers Endpoint 6-OUT Data to Endpoint 6-IN ...... 6-20
Figure 6-11. Initialization Routine ........................................................................................ 6-21
Figure 6-12. Autopointer Registers ...................................................................................... 6-23
Figure 6-13. Use of the Autopointer ..................................................................................... 6-24
Figure 6-14. 8051 Code to Transfer External Data to a Bulk IN Buffer .............................. 6-25
Figure 7-1.
Figure 7-2.
Figure 7-3.
Figure 7-4.
Figure 7-5.
Figure 8-1.
Figure 8-2.
Figure 8-3.
Figure 8-4.
Figure 8-5.
Figure 8-6.
Figure 8-7.
Figure 8-8.
Figure 8-9.
A USB Control Transfer (This One Has a Data Stage) ..................................... 7-2
The Two Interrupts Associated with EP0 CONTROL Transfers ...................... 7-3
Registers Associated with EP0 Control Transfers ............................................. 7-4
Data Flow for a Get_Status Request .................................................................. 7-7
Using the Setup Data Pointer (SUDPTR) for Get_Descriptor Requests ......... 7-13
EZ-USB Isochronous Endpoints 8-15 ................................................................ 8-1
Isochronous IN Endpoint Registers ................................................................... 8-2
Isochronous OUT Registers ............................................................................... 8-4
FIFO Start Address Format ................................................................................ 8-5
Assembler Translates FIFO Sizes to Addresses ................................................ 8-7
8051 Code to Transfer Data to an Isochronous FIFO (IN8DATA) ................... 8-8
8051 MOVX Instructions ................................................................................... 8-9
Fast Transfer, EZ-USB to Outside Memory .................................................... 8-10
Fast Transfer, Outside Memory to EZ-USB .................................................... 8-11
Figure 8-10. The FASTXFR Register Controls FRD# and FWR# Strobes .......................... 8-11
Figure 8-11. Fast Write Timing ............................................................................................ 8-12
Figure 8-12. Fast Read Timing ............................................................................................. 8-13
Figure 8-13. 8051 Code to Transfer 640 Bytes of External Data to an Isochronous
IN FIFO ............................................................................................................ 8-14
Figure 8-14. ISOCTL Register ............................................................................................. 8-15
Figure 8-15. ZBCOUT Register ........................................................................................... 8-16
Figure 9-1.
Figure 9-2.
Figure 9-3.
Figure 9-4.
Figure 9-5.
Figure 9-6.
Figure 9-7.
Figure 9-8.
Figure 9-9.
EZ-USB Wakeup Interrupt ................................................................................ 9-2
USB Interrupts ................................................................................................... 9-4
The Order of Clearing Interrupt Requests is Important ..................................... 9-6
EZ-USB Interrupt Registers ............................................................................... 9-7
SUTOK and SUDAV Interrupts ........................................................................ 9-8
A Start Of Frame (SOF) Packet ......................................................................... 9-9
The Autovector Mechanism in Action ............................................................. 9-12
I2C Interrupt Enable Bits and Registers ........................................................... 9-13
IN Bulk NAK Interrupt Request Register ........................................................ 9-14
Figure 9-10. IN Bulk NAK Interrupt Enable Register .......................................................... 9-14
Figure 9-11. I2C Mode Register ............................................................................................ 9-15
Figure 9-12. I2C Control and Status Register ....................................................................... 9-15
Figure 9-13. I2C Data ............................................................................................................ 9-15
Figure 10-1. EZ-USB Resets ................................................................................................ 10-1
Figure 11-1. Suspend-Resume Control ................................................................................. 11-1
Figure 11-2. EZ-USB Suspend Sequence ............................................................................. 11-2
Figure 11-3. EZ-USB Resume Sequence ............................................................................. 11-3
Figure 11-4. USB Control and Status Register ..................................................................... 11-4
viii
List of Figures
EZ-USB TRM v1.9
CYPRESS [ CYPRESS ]
