Usb Realize Endpoint Register (Usbreep - 0Xe009 0044) - Philips LPC214 Series User Manual

Philips Semiconductors
Volume 1
Bit 23
Symbol EP11TX
Bit 15
Symbol EP7TX
Bit 7
Symbol EP3TX
Table 194: USB Endpoint Interrupt Priority register (USBEpIntPri - address 0xE009 0040) bit description
Bit Symbol Value
31:0 See 0
USBEpIntPri
bit allocation
1
table above

14.7.12 USB Realize Endpoint register (USBReEp - 0xE009 0044)

Though fixed-endpoint configuration implements 32 endpoints, it is not a must that all
have to be used. If the endpoint has to be used, it should have buffer space in the
EP_RAM. The EP_RAM space can be optimized by realizing a subset of endpoints. This
is done through programming the Realize Endpoint register. Each physical endpoint has
one bit as shown in
Table 195: USB Realize Endpoint register (USBReEp - address 0xE009 0044) bit allocation
Reset value: 0x0000 0003
Bit 31
Symbol EP31
Bit 23
Symbol EP23
Bit 15
Symbol EP15
Bit 7
Symbol EP7
Table 196: USB Realize Endpoint register (USBReEp - address 0xE009 0044) bit description
Bit Symbol Value
0 EP0 0
1
1 EP1 0
1
31:2 EPxx 0
1
At power on only default control endpoint is realized. Other endpoints if required have to
be realized by programming the corresponding bit in the Realize Endpoint register.
Realization of endpoints is a multi-cycle operation. The pseudo code of endpoint
realization is shown below.
for every endpoint to be realized,
9397 750 XXXXX
User manual
22 21
EP11RX EP10TX
14 13
EP7RX EP6TX
6 5
EP3RX EP2TX
Description
The corresponding interrupt will be routed to the slow endpoint interrupt bit
in the Device Status register.
The corresponding interrupt will be routed to the fast endpoint interrupt bit
in the Device Status register.
Table 196. The USBReEp is a read/write register.
30 29
EP30 EP29
22 21
EP22 EP21
14 13
EP14 EP13
6 5
EP6 EP5
Description
Control endpoint EP0 is not realized.
Control endpoint EP0 is realized.
Control endpoint EP1 is not realized.
Control endpoint EP1 is realized.
Endpoint EPxx is not realized.
Endpoint EPxx is realized.
Rev. 01 — 15 August 2005
Chapter 14: USB Device Controller
20 19
EP10RX EP9TX
12 11
EP6RX EP5TX
4 3
EP2RX EP1TX
28 27
EP28 EP27
20 19
EP20 EP19
12 11
EP12 EP11
4 3
EP4 EP3
UM10139
18 17
EP9RX EP8TX
10 9
EP5RX EP4TX
2 1
EP1RX EP0TX
Reset value
0
26 25
EP26 EP25
18 17
EP18 EP17
10 9
EP10 EP9
2 1
EP2 EP1
Reset value
1
1
0
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
16
EP8RX
8
EP4RX
0
EP0RX
24
EP24
16
EP16
8
EP8
0
EP0
208