SSRC(2:0] O X 12M3 EN1 EN2 L EN3 L SDATA P7 H& PO》,P》P2》P3 max(tpLZmax, tpHZmax) min(tpzLmins tpzHmin) 截止时间EN1 EN2_L, EN3_L max(tpLZmax, tpHZmax) min(tpZLmin, tpZHmin) SSRC[2:0] 7 0 1 2 3 SDATA P7 P0 P1 P2 P3 截止时间