求Iphone 4接口定义

百度大把

1,DGND 2 DGND 3 TPA+ 4 USBD+ 5 TPA- 6 USBD- 7 TPB+ 8 USB Vbus 9 TPB- 10 Accessory Identify 11 F/W PWR+ 12 F/W PWR+ 13 Accessory Power 14 NC 15 DGND 16 DGND 17 NC 18 iPod RX 19 iPod TX 20 ACCessory Detect 21 SVideo Y 22 SVideoC 23 Composite Video 24 Remote Sense 25 LINE-INL 26 LINE-INR 27 LINE-OUT L 28 LINE-OUT R 29 A/V Return 30 iPod Detect

第一脚在哪个方向啊?我准备做一条兼容苹果的数据线。