H8SSLASH2218 datasheet(566/750 Pages) RENESAS

566 / 750 page

Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 518 of 698

REJ09B0074-0600

(1) Transition from normal operation to stall

(1-1)

Transaction request

USB

Reference

USB function module

(1-2)

Stall handshake

Stall

To (2-1) or (3-1)

To (1-3)

Normal status restored

(1-3)

(2) When Clear Feature is sent after EPnSTL has been cleared

(2-1)

Stall handshake

Transaction request

(2-2)

Clear Feature command

(2-3)

(3) When Clear Feature is sent before EPnSTL is cleared to 0

(3-1)

1. Set EPnSTL to 1 by

firmware

1. Receive IN/OUT

token from the host

2. Refer to EPnSTL

1. Transmit stall

handshake

1. Clear internal status

bit to 0

1. Clear internal status

bit to 0

2. No change in

EPnSTL bit

1. SCME is set to 0

2. EPnSTL is set to 1

3. Set internal status

bit to 1

4. Transmit stall

handshake

1. Clear EPnSTL to 0

by firmware

2. Receive IN/OUT

token from the host

3. Internal status bit

has been set to 1

4. EPnSTL is not

referred to

5. No change in

internal status bit

To (1-2)

Internal status bit

EPnSTL

→ 1

Internal status bit

EPnSTL

Internal status bit

→ 1

EPnSTL

1 (SCME = 0)

Internal status bit

EPnSTL

→ 0

Internal status bit

EPnSTL

Internal status bit

→ 0

EPnSTL

Internal status bit

→ 0

EPnSTL

Figure 14.20 Forcible Stall by Firmware

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