SAM4L Datasheet, PDF (344/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

Figure 17-6. Memory organization
U S B B u ffe rs
EPn BK1
EPn BK0
ATSAM4L4/L2
U S B d e s c rip to rs
B ank1
B ank0
R e s e rv e d
EPn_C TR _STA_BK1
E P n _ P C K S IZ E _ B K 1
EPn_AD D R _BK1
R e s e rv e d
EPn_C TR _STA_BK0
E P n _ P C K S IZ E _ B K 0
EPn_AD D R _BK0
B ank1
B ank0
B ank1
B ank0
R e s e rv e d
EP1_C TR _STA_BK1
E P 1 _ P C K S IZ E _ B K 1
EP1_AD D R _BK1
R e s e rv e d
EP1_C TR _STA_BK0
E P 1 _ P C K S IZ E _ B K 0
EP1_AD D R _BK0
R e s e rv e d
EP0_C TR _STA_BK1
E P 0 _ P C K S IZ E _ B K 1
EP0_AD D R _BK1
R e s e rv e d
EP0_C TR _STA_BK0
E P 0 _ P C K S IZ E _ B K 0
EP0_AD D R _BK0
+0x03C
+0x038
+0x034
+0x030
+0x02C
+0x028
+0x024
+0x020
+0x01C
+0x018
+0x014
+0x010
+0x00C
+0x008
+0x004
+0x000
UDESCA
Each descriptor of an endpoint n consists of four words.
• The address of the endpoint and the bank used (EPn_ADDR_BK0/1).
• The packet size information for the endpoint and bank (EPn_PCKSIZE_BK0/1):
Table 17-3. EPn_PCKSIZE_BK0/1 structure
31
AUTO_ZLP
30:16
15
MULTI_PACKET_SIZE -
14:0
BYTE_COUNT
– AUTO_ZLP: Auto zero length packet, see ”Multi packet mode for IN endpoints” on
page 349.
– MULTI_PACKET_SIZE: see ”Multi packet mode and single packet mode.” on page
346.
– BYTE_COUNT: see ”Multi packet mode and single packet mode.” on page 346.
42023C–SAM–02/2013
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